After Justin Bieber got boo’d for lip-syncing during his performances at the 2013 Billboard Music Awards, it looked like he needed a little sugar from his boo thing, Selena Gomez. With their on-again/off-again relationship, the Biebz and Selena Gomez were caught smooching backstage… and there are pics! Are they back together? Hit the jump to watch the two love birds lock lips in the gallery and decide for yourself!