Just Bieber was out at Rihanna's after-pary after the 59th Annual Grammy Awards which was held at the 10ak nightclub on Sunday night. Bieber's ex-girlfriend, Selena Gomez was spotted with new boyfriend The Weekend, and the two seemed to be getting very cozy. Bieber was seen leaving the party shortly after he arrived. Earlier on Sunday, Justin was using Instagram's live feed to throw shade at The Weekend. Bieber mocked that "StarBoy" was his favorite song before laugh with him and his friends.