Must've Been a Beautiful Babe

It's hard to picture celebs like Leo, Sarah Jessica and Nicole as diaper-clad tots, but even those famous folks were once mere munchkins. Stroll down memory lane as we peek at big stars back when they were little tykes.

A LITTLE PRINCE

Blessed with mom Princess Diana's sapphire eyes and infectious giggle, Prince William (pictured with dad Prince Charles in 1982) was capturing hearts from a young age. His heartthrob status has only increased through the years, and as he turned 18 in 2000, a pal's father told PEOPLE that the handsome royal was already "aware of his sex appeal."