Pop star Justin Bieber is facing more embarrassment after a mystery brunette filmed him sleeping in a hotel room. The Boyfriend hitmaker can been seen dozing topless on a huge sofa with his trademark red baseball cap beside him as the young woman films with a cell phone. As the 15-second clip ends she turns the camera on herself, blows a kiss, and smiles and waves at the still snoozing singer. It is not clear when the film was shot but online rumours suggest it was during the current South American leg of his Believe world tour. The trek has been dogged by drama - Bieber stormed off stage in Sao Paulo, Brazil on Saturday (02Nov13) after being hit in the head with a bottle, and he was ambushed by a topless male fan at a show in Rio de Janeiro the following night (03Nov13). Dozens of teenagers at a meet-and-greet session were left disappointed after he allegedly refused to interact with them, and on Wednesday (06Nov13) it emerged Bieber is under police investigation for apparently spraying graffiti on the outside of a Rio hotel.