How Music Stars Spent Summer Vacation

Katy Perry hits the rodeo! Britney Spears goes for a ride with DJ Pauly D! See how the stars spent the hot summer months

  • JUSTIN BIEBER photo | Justin Bieber

Credit: Courtesy Justin Bieber

Updated: Monday Sep 12, 2011 | 06:00 AM EDT By: Cara Lynn Shultz

JUSTIN BIEBER

He's on a boat ... planking! The singer joined Rev Run's son, Diggy Simmons, to show off the pose of the summer, taking part in a little waterside planking.

See Katy Perry, Hilary Duff and more stars planking and acting up online!