Prince William and Michael Phelps bonded over fatherhood.
The royal presented the Olympic swimmer with his Lifetime Achievement Award at the BBC Sports Personality of the Year awards in Birmingham, England, over the weekend and the pair chatted about their children.
William has Prince George, three and 19-month-old daughter Princess Charlotte with his wife Duchess Catherine, while Michael and his spouse Nicole Johnson have seven-month-old son Boomer together.
After asking Boomer’s age, William joked: "Oh, I see why the retirement is looming. You’ll never leave the house again!"
William gave a rambling speech when he presented Michael with his award at the star-studded ceremony.
He said: "It’s a particular privilege to be here tonight Michael to give you your Lifetime Achievement Award. You’re one of the greatest sporting icons the world has ever had. Your 23 gold medals, never mind all the other colours, pales into sheer superhuman history. You should be so proud of your achievements and it will be many many years, if ever before anyone stands here again and calls you the greatest athlete in history so many many congratulations and hopefully your retirement gives somebody else the chance now."