See hilarious old pictures of Mariah Carey, Nicki Minaj, Keith Urban and Randy Jackson
Steven Tyler: Then
Aerosmith's frontman -- also dad to actress Liv Tyler -- earned his industry cred in the 70s Boston-based rock band. Struggling with a heavy drug and alcohol addiction, Tyler completed drug rehab in 1986 and, aside from a brief relapse in the late 2000s, has been sober ever since.
Credit: Fin Costello/Redferns