Justin Bieber and Selena Gomez kiss backstage at Billboards; Taylor Swift is not amusedAdd to Favorites | 2014 Billboard Music Awards
At some point in the evening, Selena and pal Taylor Swift enter the backstage area at the awards. Bieber grabs Selena's arm to say hello and the two exchange a smooch -- as Taylor sticks out her tongue, in an obvious display of what she thinks about that.
We're with you, T-Swizzle.
Eventually an unidentified redheaded girl pulls Gomez away from her on-again, off-again beau. Oh, young love. Video below, starting at around the 0:53-mark.