Billy Joel has sold more than 150 million records in his career, and is celebrating his 50th year in the business.
You don't get to be the world's sixth best-selling artist of all time without making a few famous friends along the way.
Sure enough, Billy - who turns 65 today - has had his share of celebrated collaborators, fans and A-list friends. Oh, and a supermodel wife to boot.
On this special day, we salute you, sir - with a roll call of your famous pals. How many can you name?