Singer Justin Bieber is mobbed by photographers as he leaves LAX airport in Los Angeles Thursday.<br/> <br />The 20-year-old Canadian pop star was held by immigration and customs agents for lengthy questioning on his return from Japan.<br/> <br />It's unclear if Bieber's recent legal troubles had anything to do with it.<br/> <br />Bieber is facing trial in Miami for drunk driving and resisting arrest, and was charged for assaulting a limo driver in Toronto.<br/> <br />He's even in trouble with his neighbors, after pelting their house with eggs.
