Sean Penn's Son Strips Down For Short Film, 'Back In The Game'

12/01/2011 10:29 am ET | Updated Jan 31, 2012
  • tmz.com

There's a damn good reason Sean Penn's 18-year-old son recently stripped down to his skivvies and hung out with a bunch of lingerie-clad models -- HE'S SEAN PENN'S SON!!!

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