Boxing great Muhammad Ali was born Cassius Marcellus Clay Jr. He changed his name in 1964 after joining the Nation of Islam. (Trevor Humphries/Getty Images)
Our favorite “Golden Girl,” Betty White, celebrates her 89th birthday today. (Photo by Frederick M. Brown/Getty Images)
The man with the plastic face turns 49 today. Happy Birthday Jim Carrey! (Photo by Marco Secchi/Getty Images for Disney)
So you wanna be a rock star like Kid Rock? The Grammy-nominated artist celebrates his 40th birthday today. (Photo by Rick Diamond/Getty Images)
