Alex Pettyfer Flashes Abs for Stripper Movie

9/21/2011 2:30 AM PDT

"I Am Number Four" star Alex Pettyfer showed off his toned, hairless abs -- and boxer briefs -- while on set of that Channing Tatum stripper movie "Magic Mike" in L.A. on Tuesday.

The jacked up 21-year-old was made to play an exotic dancer.