Taylor Swift and Jon Bon Jovi were attending the Winter White Gala at Kensington Palace Tuesday evening.  The gala is an event raising money for Centrepoint, a charity providing housing and other services to young homeless people in the U.K.

Both Swift and Bon Jovi were slated to perform before the gathering of 200 donors.  But when it came to the classic, "Living On A Prayer", it was Prince William who stole the show.  Here's a clip of that performance.