Justin Bieber and Selena Gomez were just one of the cute couples at the Billboard Awards in Las Vegas last night. They got cozy in the audience while watching performances from Britney Spears, Rihanna, and Beyoncé, but all eyes were on them when Justin and Selena kissed for the cameras during the nationally televised event. Justin didn't mention his girlfriend when he took the stage to accept his multiple awards, though he did call her "amazing" backstage. The teenage duo kept their relationship under wraps for a while and only stepped out publicly for the first time at Vanity Fair's Oscars bash in February. Justin and Selena seem to be increasingly comfortable showing off their relationship, as they also lip-locked at a press conference earlier this month.