The Biebs Pranks Willow Smith

JUSTIN BIEBER pulled a prank on WILLOW SMITH at their concert in the U.K. last weekend.  And she’s vowed to dole out some payback.  In the middle of Willow’s performance of “Whip My Hair”, Justin, his manager, his “swagger coach,” and Willow’s brother JADEN SMITH crashed the stage!  Here’s the video…