How many girls fell in love for the first time in 1991 when they saw this adorable face on "Growing Pains"? We sure did! But that wasn't even Leo's first big break: He'd already appeared in a handful of television roles the previous year. Now, the former child star is an A-list actor and three-time Oscar nominee. Do we really need to cover his memorable résumé or the long list of Hollywood hotties who also fell head over heels for him?