Justin Bieber and Selena Gomez kiss backstage at Billboards; Taylor Swift is not amused

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justin-bieber-selena-gomez-kiss-billboard-taylor-swift.jpgIn the on-going saga that is Justin Bieber and Selena Gomez's relationship, more fuel was added to the fire Sunday night (May 19) backstage at the 2013 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.

Photo/Video credit: ABC