Celebrities who've had plastic surgery

31 of 36: David Hasselhoff has said he has used Botox in the past. Pictured: To the left, David Hasselhoff appears in a scene from the 1982 film 'Knight Rider.' At right, he appears in a still for 'America's Got Talent.'

It is unclear whether David Hasselhoff underwent cosmetic procedures prior to appearing in the 1982 film 'Knight Rider.'

( Photo / MPTV Images / Fremantle Media)