Bad boy Bieber? New concerns about pop star's behavior – Sara Sidner has the detailsUpdated 9:20 AM ET, Fri May 31, 2013 Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.JUST WATCHEDBad boy Bieber? ReplayMore Videos ...MUST WATCHBad boy Bieber? 02:19Bieber fever may be leading to a meltdown for the the star himself. Justin Bieber's latest antics are raising concerns. Sara Sidner has the details.