!! OMG, he's naked: Ryan Phillippe !!
I was introduced to Ryan Phillippe in high school when my friend and I snuck into 54 (she was not yet 17), where he runs around in a g-string for most of the movie, and spends the rest either naked or in a Santa suit (above).
Ryan followed up that performance with his role as a sex-addicted bad guy in Cruel Intentions. His perfect butt featured prominently in both films, and I've commemorated it after the jump with videos and stills [NSFW].
Click to enlarge. Download the Cruel Intentions video here.
The following stills are from 54. Download the 54 video here.