Demi Lovato has tweeted her support to her best friend Selena Gomez.
The 'Neon Lights' singer posted a heartfelt message on Twitter yesterday (05.02.14) after news broke that Selena spent two weeks in rehab this January, with TMZ claiming she was treated for alcohol, marijuana and prescription drug Ambien dependencies.
The 21-year-old star wrote: "Weakness is living in denial. Only the strongest people ask for help."
Demi famously checked into a treatment facility in December 2010 for help with an eating disorder, self-harm and depression, only revealing last winter that she also had serious drug and alcohol dependency issues at the time.
Selena is said to have sought help to work on her "emotional life" because of her on/off relationship with wild child Justin Bieber.
A source told E! News: "The last straw was seeing them on the Segways. She needed to work on her emotional life. She needed to learn tools on how to deal with Justin and letting go of that relationship.
"This is the first time she's ever taken the time to deal with issues, to deal with herself, with a therapist."
A representative for the 'Come & Get It' hitmaker confirmed Selena had spent a fortnight at Arizona's Dawn at the Meadows last month, but denied she had "substance abuse" problems.
Selena and Demi - who first met as children on the set of 'Barney & Friends' - recently rekindled their friendship, with Selena admitting she felt guilty for not supporting Demi during her darkest hour because she didn't understand what she was going through.

Madonna received death threats for defending Pussy Riot.
The 'Hung Up' hitmaker gave an impassioned speech at the Amnesty International Concert in New York last night (05.02.14), in which she described herself as a "freedom fighter" as she introduced the Russian group - who were jailed on charges of hooliganism motivated by religious hatred after performing a protest song in a Moscow cathedral - to the stage to address the audience at the Barclays Center.
She said: "The right to be free, to speak our minds, to have an opinion, to love who we want to love, to be who we are -- do we have to fight for that?
"I've always considered myself a freedom fighter since the early '80s when I realised I had a voice and I could sing more than songs about being a material girl or feeling like a virgin. And I have definitely paid for and have been punished for speaking my mind and for sticking my neck out for this kind of discrimination. But that's OK."
Madonna also admitted she was threatened with arrest for her performances in Russia in 2012 because they promoted "gay behaviour".
She added: "Needless to say, I did not change one moment of my show. 87 of my fans were arrested for gay behaviour - whatever that is."
And the 55-year-old singer - who raises children Lourdes, 17, Rocco, 13, David, and Mercy, both eight - also joked about the group's name.
She said: "I'd like to thank Pussy Riot for making pussy a 'sayable' word in my household. Now, my eight year olds say it all the time."
While Madonna and Pussy Riot didn't perform at the concert, stars including Cold War Kids, Lauryn Hill and Blondie performed a selection of their hits.

Alyssa Milano is "actively trying" for another baby.
The 41-year-old actress gave birth to son Milo in August 2011, but she and husband David Bugliari are keen to give the tot a little brother or sister sooner rather than later.
Speaking to Access Hollywood Live, she said: "We are actively trying."
She added jokingly: "[David's] just chugging down ginseng [a herbal remedy believed to increase sex drive and improve erectile function in men]."
However, the 'Mistresses' star recently admitted she was finding it hard shedding the baby weight from her first pregnancy and still wanted to lose another 10 pounds.
She said earlier this week: "I gained 55 pounds when I was pregnant, I still have 10 more to lose."
Meanwhile, the brunette beauty - who shot to fame on 'Who's the Boss' when she was 11 years old - was forced to defend her figure last month after being insulted by 'Suburgatory' star Jay Mohr during a radio interview.
He said: "It seems like she had a baby and said, 'I don't really give a s**t'.... I read it on her gut."
Alyssa challenged him on Twitter after hearing the rude remarks on Christmas Day (25.12.13), before accepting his apology last week.

Jamie Chung wants her wedding guests to go on a hike.
The 'Hangover' star got engaged to Bryan Greenberg at the end of last year, and is already considering ways she can incorporate her active lifestyle and passion for sport into her big day.
She said: "We love working out. We love the outdoors. So we want to incorporate that - maybe make it a weekend and have all the guests go on a hike. Or there's a crazy obstacle course at this one location. We literally have to do something every day in terms of something physical."
The brunette beauty - who started dating her beau in 2012 - has been eyeing up venues for the nuptials and, although she's yet to finalise a location, she's keen to tie the knot in a woodland.
She explained to People magazine: "We want to do it somewhere in the woods. We're looking at some locations in California - we just don't know where it's going to be yet. It's going to be a fun wedding."
Meanwhile, Jamie, 30, and Bryan, 35, are yet to set a date for their wedding, but have their hearts set on becoming husband and wife next year and are already considering preparations in order to reduce the stress load nearer the time.
When asked if she's set a date for the nuptials, she said: "Oh, I don't know ... maybe fall 2015.
"I think it really is stress-induced in terms of planning a wedding, but we've kind of initiated the conversation. I think the sooner you start, the less stressed out you're going to be."

'The Michael J. Fox Show' has been cancelled after just 15 episodes.
The 'Back to the Future' actor's self-titled sitcom has lost its prime time Thursday night slot in favour of 'Hollywood Game Night' - a game show presented by Jane Lynch - after network NBC decided to pull the plug because of poor ratings.
Entertainment Weekly confirmed the news on Wednesday night (05.02.14) and with only 15 out the 22 episodes of the show having been aired so far, it's still unclear whether the remaining instalments will be broadcast at all.
The reports come after NBC chairman Robert Greenblatt described 'The Michael J. Fox Show' as a "uphill battle" at the Television Critics Association press tour last month, admitting he wasn't happy with its dismal ratings.
Despite the show's failure to pull in audiences, the series was honoured, along with five others, with the Critics' Choice Television Award for Most Exciting New Series in June last year.
The series marked a highly anticipated return to television for Fox, who hadn't had a leading role in a sitcom since his five-year stint in 'Spin City' came to an end in 2000 as his battle with Parkinson's disease - which he was diagnosed with in 1991 - worsened.
The actor - who set up the Michael J. Fox Foundation to help find a cure for the degenerative condition - had only made several minor guest appearances on TV shows, including 'Rescue Me', 'Curb Your Enthusiasm' and 'The Good Wife', before 'The Michael J. Fox Show' was commissioned.

Sir Elton John's Rocket Features banner will adapt musical 'Joseph and the Amazing Technicolor Dreamcoat' for the big screen.
The 66-year-old singer's production company has acquired film rights to Andrew Lloyd Webber and Tim Rice's famed musical which 'The Diving Board' hitmaker will executive produce alongside the composer and lyricist.
Steve Hamilton Shaw and David Furnish who will produce are "excited" about the project.
Shaw explained: "Joseph and the Amazing Technicolor Dreamcoat is one of the most popular musical experiences ever conceived.
"We are excited about the huge potential of a contemporary animated version, and we're thrilled to bring this to the big screen in partnership with Andrew Lloyd Webber and Tim Rice."
The musical which is based on the coat of many colours story of Joseph from the Bible's Book of Genesis premiered on Broadway in 1982 at the Royale Theatre and become a box office hit shortly after.
The forthcoming film is being adapted in association with Webber's The Really Useful Group and he is thrilled to share the story with "many more" people.
The 65-year-old star stated: "'Joseph and the Amazing Technicolor Dreamcoat' started in a school and was the first step on the path that led to my musicals with Tim Rice.
"It is now being performed all over the world by a fourth generation of school kids, and a great movie can only help Joseph being part of the lives of many more."

Gary Oldman says Ben Affleck doesn't need any advice to play Batman.
The 55-year-old actor - who portrayed police office James Gordon in Christopher Nolan's Batman trilogy - insists Affleck will be fine when it takes on the Role of The Caped Crusader opposite Henry Cavill as Superman in the 'Man of Steel' sequel, despite criticism his casting has attracted from fans.
When asked if he had any words of wisdom for Affleck about taking on the part of the iconic comic book character, Oldman told BANG Showbiz: "Advice for Ben Affleck? He doesn't need my advice! He's great."
The British star - who appeared opposite Christian Bale as Batman in their movies - also revealed he was charmed into accepting the part of Dr. Dennett Norton in the 'Robocop' remake by the director José Padilha.
Speaking at the movie's world premiere at London's BFI IMAX Odeon cinema on Wednesday night (05.02.14), he said: "This film wasn't on my list of things to do but in came in and I read it and I thought it was fun, and I like José the director, he was a charmer."
Oldman also insists they are significant differences between the new film and the original 1987 version, directed by Paul Verhoeven.
He added: "I saw the original when it came out. I haven't seen it since. It was more of a horror I remember - it was more violent and had more gore than ours."
Oldman was joined at the event by his co-stars Abbie Cornish and Joel Kinnaman - who plays Alex Murphy, the cop who is turned into the the cyborg law enforcer - and director José.
The actor braved wind and rain to stop and sign autographs for fans and pose for photos.

Emma Watson will star in 'Regression'.
The 23-year-old actress - who was catapulted to the spotlight as Hermione Granger in the Harry Potter franchise when she was just nine years old - is thrilled to be working with 41-year-old Alejandro Amenabar who is directing the thriller from the screenplay he wrote, according to Variety.com.
Watson said: "I am passionate about Alejandro and his work and am so happy to be collaborating with him. I'm really excited by the challenge my character presents to me as an actress... I can't wait to begin."
The blonde beauty is set to star alongside 43-year-old A-Lister Ethan Hawke in the Weinstein Company's - founded by Bob and Harvey Weinstein in 2005 - forthcoming film which is set for a 2015 release.
Amenabar has previously worked with the Weinsteins on supernatural horror 'The Others', which featured Nicole Kidman and grossed $210 million worldwide.
Following the success of the final instalment of Harry Potter - titled 'Harry Potter and the Deathly Hallows - Part 2' - in 2011, Watson took short break and previously admitted 2013's 'The Perks of Being a Wallflower' encouraged her to step back into the film industry.
Since then she has been cast in a number of Hollywood hits including Seth Rogen's 'This Is the End', Sofia Coppola's 'The Bling Ring' and will be on the big screen in 2014's 'Noah' which is in post-production.

Prince performed two gigs at Camden's Electric Ballroom in London last night (05.01.14).
The 'Purple Rain' hitmaker took to the stage after a secret gig at the same venue on Wednesday evening and thousands of fans queued for hours in the rain, despite not knowing details of the performances or ticket prices.
Eventually, more than 800 people were allowed in the venue after the doors opened at 7pm and paid just £10 to see the legendary singer perform a special gig with his all-female band 3rd Eye Girl.
The set included new single 'Pretzelbodylogic', along with 'Let's Go Crazy', 'Funk 'n' Roll', 'Guitar' and 'She's Always in My Hair', in which the 55-year-old singer changed the lyrics to, 'Always in Prince's big curly hair'.
Audience members shouted: "London loves you", before he handed his guitar out to the crowd and dozens of fans surged forward.
The singer came back on for a second encore before the fans were ejected from the venue and security let in hundreds of people who were still queuing outside.
The star powered through tracks including 'Cause and Effect', 'I Would Die 4 U' and 'Something in the Water (Does Not Compute)' during the second set, before ending the first encore with a sensuous rendition of 'Purple Rain'.
He then closed the gig with a medley of hits, including 'When Doves Cry' and 'Sign o' The Times'.
VIP guests at the gigs included Paloma Faith, Nicole Scherzinger and Lianne La Havas, who welcomed Prince into her home for a secret press conference this week.
The singer has ruled out playing any large venues while in London with his band this month, hinting instead of his desire to play small club gigs.
Speaking to BBC 6 Music, he said he wants to play venues such as Ronnie Scott's and the Bag O' Nails Club in Soho - although details for future gigs are being kept under wraps.
He described his trip to London as "open-ended" and told last night's audience: "We're gonna try and find somewhere else to play in this city. We'll stay as long as you'll have us."

Ozzy Osbourne was speechless when introducing Ringo Starr at The Grammy Awards.
The Black Sabbath rocker became so "overwhelmed" by his idol that he was unable to find the words to welcome The Beatles' drummer to the stage at last month's ceremony when he saw Sir Paul McCartney and John Lennon's widow Yoko Ono in the crowd.
Ozzy's wife Sharon Osbourne explained: "He looked down, he saw Paul and he saw Yoko - but nothing came out. He was overcome. I've been with Ozzy for coming up 35 years and every single day for those 25 years he has always listened to The Beatles."
'The X Factor' judge also revealed she used to play The Beatles' hits in a bid to simulate Ozzy when he was in coma for eight days following a serious motorcycle accident in 2003.
Sharon added: "When he was in a coma, after he had his motorbike accident, we used to blast The Beatles in his room. So he lost it."
Meanwhile, Paul McCartney and Ringo Starr will feature in a CBS special, 'The Night That Changed America: A GRAMMY Salute To The Beatles' to commemorate the group - which also included the late John Lennon and George Harris - and their American TV debut on the 'Ed Sullivan Show'.
The pair were interviewed by chat show host David Letterman, and given tributes from Stevie Wonder, Alicia Keys and Katy Perry before taking to the stage to perform together.
The pre-recorded show will air Sunday, February 9.

Britain's Prince Charles visited Tottenham, north London on Wednesday (05.02.14).
This trip marked the 65-year-old royal's fourth visit to the area in the Borough of Haringey since the riots in August 2011, and the local community "hugely appreciate" Charles efforts and were delighted to see him.
Tottenham MP David Lammy told the tottenhamjournal.co.uk: "He has now been back to Tottenham four times in two-and-a-half years, which is unprecedented. There is no other public figure, not even the Prime Minister, who has visited Tottenham as much. His charities are continuing to work in the community and he is coming back to get an update.
"He is a familiar face now in Tottenham. It is hugely welcome for us and it is hugely appreciated. It sends an important message that Tottenham is open for business."
Charles met members of Haringey Youth Council, viewed the nearly-rebuilt Carpetright building which was set alight during the riots before going to Tottenham Green.
A number of the Prince of Wales' charities are helping with the borough's regeneration, including an enterprise programme, run by the Prince's Trust which helps ambitious young people launch their own businesses.

Jim Davidson feels "reassured" by winning 'Celebrity Big Brother'.
The comedian - who had to miss out on a place in the show last year because he was being investigated for historic sexual abuse claims - is unsure how he won over the public to take this year's crown and says his victory marks the end of a "year of hell".
He told Britain's OK! magazine: "I don't quite know what and how I won. It's very nice to know the public voted for me. It's reassuring.
"Whatever I do, I'll still be slagged off by the people who don't like me. What I am aware of is that a year of hell has come to an end. I think the public said, 'Come on Jim, we know what a year you've had, we're behind you and we don't believe a word of it.' So I'm very pleased about it."
Jim sometimes struggled with life in the house because he was so much older than most of the other contestants.
He added: "I felt quite lonely in the house sometimes because I'm 60 years old and it's like being at a party with a load of 20 year olds who want to enjoy themselves. So Dad has to creep off somewhere."