Pharrell Williams wept with happiness over his success during an interview with Oprah Winfrey.
The 41-year-old star was overcome with emotion after the 'Oprah Prime' host showed him a montage of videos from all over the world that people had made to his song 'Happy', and he admitted he couldn't believe how popular the track had become.
He wept as Oprah said: "You know, I was just thinking about your grandmother. I bet she didn't even imagine that."
After Pharrell joked, "Why am I crying on Oprah?, she responded, "It's being used for something that's greater than yourself. I get that."
Pharrell then explained his tears and said: "It's overwhelming because it's like I love what I do and I just appreciate the fact that people have believed in me for so long, that I could make it to this point to feel that."
The producer was particularly delighted by the song's success as it had struggled to get any radio play before its release.
He said: "Zero air-play, nothing. And the next thing you know, we put out the video on November 21 and all of a sudden--boom. I mean, when I say boom, I mean boooooom.
"And we were like, what's happening? First of all, people are putting up their own videos. It was like no longer my song."
The legendary talk show host later admitted on twitter the exchange of "sincere and humbling" moments had made Pharrell one of her "favourite" ever interviewees, much to his shock.
He responded: "You can't imagine what that means coming from you, a rare force. So radiant."

Jesse Eisenberg will star alongside Bill Pullman and Tony Hale in 'American Ultra'.
The 'Social Network' actor began filming for the action-comedy yesterday (14.04.14) and it's now been revealed that 'Independence Day' star Bill Pullman and 'Arrested Development' funny man Tony Hale have been confirmed to complete the cast.
The film - which Lionsgate paid $7 million for in March - stars Eisenberg as a "hapless and unmotivated stoner" whose small-town life with his girlfriend, played by Kristen Stewart, is suddenly turned upside down when his secret past as a sleeper agent comes back to haunt him, according to Deadline.com.
'Project X' director Nima Nourizadeh is helming the project, which follows a script penned by 'Chronicle' writer Max Landis, and Topher Grace, Romeo and Juliet's John Leguizamo and Walton Goggins will also co-star alongside Pullman and Hale.
Eternal Sunshine of the Spotless Mind's Anthony Bregman, alongside Kevin Frakes, Raj Brinder Singh, The Walking Dead's David Alpert and Britton Rizzio will produce for PalmStar, Likely Story and Circle of Confusion with Ray Angelic taking on the role of executive producer.
'American Ultra' is slated for release in 2015.

Olly Murs has collaborated with former Kaiser Chiefs star Nick Hodgson.
The 'Trouble' hitmaker paired up with the the former drummer, backing vocalist and lyricist for the 'I Predict A Riot' rockers - who now works as a producer and song writer at his Chewido studios in London - after being introduced by The Ordinary Boys frontman and former 'Celebrity Big Brother' star Preston, who has been writing for Olly since he was runner up on 'The X Factor' in 2009.
Nick told the Daily Star newspaper: "I've known Preston since the Kaisers supported The Ordinary boys when we started out.
"He phoned to see if I fancied writing with them, and it was an interesting idea.
"We got a great song out of it."
The 36-year-old musician - who parted ways with the Kaiser Chiefs in 2012 - confessed that although Olly, 29, has a very different style, he enjoyed working on the song for the pop heartthrob's new album.
He added: "I hadn't met him before, but I liked Olly a lot."
Olly has previously stated that his new album is to be released this summer.

'Coronation Street's Maria Connor's behaviour is set to become "erratic and unpredictable" in coming weeks.
The hairdresser - played by Samia Ghadie - takes comfort from her former lover Tyrone Dobbs (Alan Halsall) and his girlfriend Fiz Stape (Jennie McAlpine) after she caught her boyfriend Marcus Dent (Charlie Condou) having an affair with Todd Grimshaw (Bruno Langley) earlier this month.
Speaking to ITV.com, Samia said: "Her behaviour becomes a bit more erratic, Marcus has gone off so she's happy she doesn't have to see him every day, but she does have to see Todd. That's not easy for her, that makes her behaviour a little bit unpredictable and her friends are concerned about her."
However, the blonde beauty takes things too far when she pretends to be Tyrone's psycho ex-partner Kirsty Soames (Natalie Gumede), who has just been released from prison, by sending him text messages signed off with "K".
Samia explained: "She's been getting a lot of support from Tyrone and Fiz, but she's been getting the wrong idea of Tyrone's support and starts seeing it more than it is.
"It's so far from right, it's so wrong. Maria opened a whole can of worms with this one. There's going to be more drama to come, so stay tuned."

Lucy Watson claims she's only ever had three boyfriends.
The 'Made in Chelsea' star - who has previously dated her co-stars Spencer Matthews and Jamie Laing - admits she's quite "picky" when it comes to dating people and she'd only ever strike up a relationship with someone if there's an "electric chemistry" between them.
She said: "I'm very picky about who I go out with.
"I've only ever had three boyfriends and there has to be an electric chemistry."
However, the brunette beauty, who recently admitted she dressed up as a sexy police woman for her ex-partner, becomes quite "exotic" when she's got a boyfriend.
When asked about her recent police woman confession, she told new! magazine: "Only when I'm in a relationship! It's not like that when I'm single. I'm like a granny - I never go out, I never drink and I'm always at home with my dog.
"But I become quite exotic when I have a boyfriend. I enjoy pleasing my partner."
Despite being keen to flash the flesh in the bedroom, the 23-year-old star - who recently posted a picture of her bottom on Instagram - claims she's put on a bit of weight.
She said: "I haven't been working out much lately. I've been busy. My jeans are a bit tighter, so I know I've put on weight. I'm happy, though."

Katy Perry and Robert Pattinson's friends want them to get together.
The 'Dark Horse' singer and the 'Twilight' star were seen spending the majority of their weekend together at the Coachella Valley Music and Arts Festival in California, having both split with their former partners, and friends of the pair are said to be rooting for them to get together.
A source said: "The pair had a fling a year ago but they went their separate ways after John [Mayer] wooed Katy back and Kristen [Stewart] made it clear that she still wanted her Twilight co-star.
"But things have gone cold with R-Patz and K-Stew since, with them both deciding it's time to move on."
Rob split from his long-term girlfriend Kristen last year when it was revealed she'd been having an affair with her 'Snow White and the Huntsman' director Rupert Sanders.
Meanwhile, Katy broke it off with her other half earlier this year and mutual friends are hoping that she and Rob will finally get together now their exes are out of the way.
The source told The Sun newspaper: "Katy and Rob are the best of friends with a very strong sexual chemistry. They care a lot about each other but have always been careful not to upset Kristen.
"But Kristen's off doing her own thing and accepting it's time for both of them to move on.
"Friends genuinely want to see them get it together properly. They think they bring out the best in each other."

Cameron Diaz believes in having more than one partner.
The 'Charlie's Angels' actress, who has dated fellow celebrities including Justin Timberlake and Jared Leto in the past, has confessed she thinks women expect too much from men in a relationship.
She said: "For some reason, we get into relationships and we expect one man to understand all the parts of us and meet all of those needs.
"I think that's where everything fails."
The 41-year-old star, who is currently single, was asked if she thought having more than one partner was better, to which she replied: "Why not? Why would that be so bad?"
Cameron - who is currently starring in 'The Other Woman' as a woman who has found out her boyfriend is married - also admitted she has lots of female friends who each satisfy different needs.
She told the Daily Mirror newspaper: "We can have all of these girlfriends, all of these friendships. I know with my girlfriends I do totally different things with each one of them.
"I have different conversations. We like things that others don't like.
"There are different commonalities in each one of them and when I want to do those certain things, I can go to that girlfriend and we do those things together."

Tilda Swinton hopes vampires will wear gloves in future films.
The 53-year-old actress stars in 'Only Lovers Left Alive' as blood-sucking Eve and while working on the film she insists the cast and crew wanted to use traditional vampire elements but incorporate their own twist which she hopes catches on.
She told collider.com: "This fancy dress was really fun to work out. Of course because we were creating these creatures that had to have a similar specialness there was a lot of working it out ... [We worked out] how we could look at vampire law, take what we liked and make some new stuff up. For example, a new piece of mythology that they wear gloves all the time. We are hoping new vampire films will incorporate these gloves things."
Swinton - who earned the Best Supporting Actress Oscar for her performance in 'Michael Clayton' in 2008 - recently revealed she struggled to get meaningful roles when she started her acting career and knew she would be "a bit off an outsider" until she got older.
She explained: "I was never going to be bimbo material. So I just kept my head down in my 20s. I had this strange instinct that I would only begin to start my real work in my 40s."

Indie band Dexters will support The Enemy next month at KOKO in London.
The London band, who have just wrapped up their UK tour, will join the 'Gimme The Sign' hitmakers in May and are thrilled with the reception to their debut album 'Shimmer Gold'.
Frontman Tom Rowlett told BANG Showbiz: "I'm really happy with the reaction, a lot of the online stuff and fans. I try not to look at reviews, though. But I did have an argument with one guy who told me it was better than 'Definitely Maybe' [Oasis debut]. I was like, 'Wow, thank you very much, I'll take that as a compliment, but it ain't'. Maybe our next album, will be but he was like, 'No, this one'. I just said, 'Alright, bruv'."
The band - also made up of Chris Heggie, Ben Debo and Vincent Dignan - finished their headline tour at The Garage in Islington with an incredible live set, which included new song 'Nature Of The Beast' along with fan favourites.
Tom continued: "It's building, you can see it everywhere we go, playing bigger venues, a lot of the shows are sold out, it's great. We're looking forward to supporting The Enemy and we also have a gig with the Kaiser Chiefs coming up."
He quipped: "I'm now hoping to making some money. We're still skint. It's not why I do it. But I just want to go bowling in between gigs ... get a few strikes."
Dexters will support The Enemy at the Camden venue on Wednesday, May 28.

Peter Andre has been lying to his son about the existence of the tooth fairy.
The 'Bad As You Are' singer has been dealing with a lot of questions from his son Junior, eight, about what happens when you lose a tooth and put it under your pillow, and so far he thinks he's been able to successfully trick him with his tales.
Writing in his column for new! magazine, Peter revealed: "Junior has started asking me questions about the tooth fairy lately. He said, 'My friend was left £2.50, but my tooth fairy only left me a pound. How can they be the same fairy? And I just told him there are different tooth fairies for different areas. I said, 'Plus, you don't want the £2.50 one, you want the traditional one pounder. They're great!' He seemed satisfied with that explanation ... for now!"
Peter has had Junior and his younger sister, six-year-old Princess Tiaamii - his two children with ex-wife Katie Price - staying with him before the Easter break and the trio have been indulging in lots of traditional chocolate treats.
The 41-year-old star - who also has three-month-old daughter Amelia with his fiancée Emily MacDonagh - is now unsure as to whether he should buy his kids Easter eggs for this weekend.
Peter added: "The kids and I are having a great time leading up to Easter. I had them over the Easter holidays last year, so this year they're with me for the two weeks before the holidays. And now the weather has started getting better, we've been spending most of the time playing outside. Junior and Bista love Cadbury's Creme Eggs but they eat them all the time, so when it comes to Easter I don't quite know what to give them! I love Easter eggs too. Me and chocolate have a good relationship!"
Meanwhile, Peter has announced he is releasing a new album.
The singer will bring out 'Big Night' on May 26 and the LP is influenced by the music of Elvis Presley and Stevie Wonder and will have big band and soul elements.
The highly anticipated album is comprised of 11 tracks all written by Peter and co-writer Stevie Appleton, and includes 'Kid' which was chosen to be the official song for DreamWorks animated movie 'Mr. Peabody and Sherman'.
Speaking about the record, Peter said: "I am so excited for you all to hear this new sound - it's so different and is the type of album that I have wanted to do for many years. Now is the time - enjoy 'Big Night'."

Cameron Diaz says Kate Upton is much more than just a woman with great breasts.
The 41-year-old actress stars opposite the Sports Illustrated model in 'The Other Woman' - where their alter-egos seek revenge on three-timing lover Mark - and although Kate is famous for being a beautiful model, Cameron insists she is "amazing", "smart" and "wise".
Speaking in Britain's HELLO! magazine, Cameron said: "Kate is the greatest - and what's behind the boobs is unbelievable. It's incredible how smart she is and how wise she is and how wise she is and how she sees everything. She doesn't miss a thing. She calculates everything so fast. She's like a bullet. She just shoots it right back and you are like, 'God bless you, you are amazing.' "
Cameron - who is also joined by Leslie Mann in the big screen comedy - doesn't like competition between women and doesn't believe in jealousy.
She explained: "You know what? I hate competition between women. I'm not a competitive person, I'm always about celebrating people. I want everybody to succeed and definitely, when it comes to other women, I want them to succeed. I don't believe in being jealous of other people for their beauty or their talent or their ability. That's just something I am not really into."
Kate, 21, recently claimed her life would be "so much easier" if she had smaller breasts because she wouldn't always have to wear a support bra.
She said: "I wish I had smaller boobs every day of my life as I would love to wear spaghetti tops braless or go for the smallest bikini designs. Every single day I'm like, 'Oh man, it would be so much easier,' especially if people didn't constantly bring them up."

Eva Longoria admits her relationship can be "exhausting."
The former 'Desperate Housewives' star has been dating José Antonio Bastón, the president of Latin America's Televisa media company, since the end of last year and feels under pressure to always look her best around him.
The 39-year-old actress told 'The Ellen DeGeneres Show' on Monday (14.04.14): "He's a good dresser, too. I always have to step it up. It's exhausting."
But she said: "I'm very happy."
The brunette beauty, who is an executive producer of 'Devious Maids,' also said her boyfriend is "uber private" and doesn't enjoy being in the spotlight.
The actress, who previously dated Eduardo Cruz and was married to French basketball star Tony Parker, has been doing a lot of travelling recently but claims she loves being in airports.
She explained: "I know restaurants in certain airports that I will go earlier to the airport because I really want to eat there. Like in Dallas there's this barbecue place in terminal D, the American terminal. In San Antonio, there's a Mexican restaurant where the United Airlines are. I love airports. I like reading, I like wifi. I get very excited."