Read the full story here: http://www.tmz.com/2014/03/03/birdman... Justin Bieber now does BIRTHDAYS

Justin Bieber -- Sure, I'll Sing Happy Birthday ... To Birdman's Filthy Rich Daughter
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Read the full story here: http://www.tmz.com/2014/03/03/birdman... Justin Bieber now does BIRTHDAYS -- at least for the filthy rich daughters of millionaire rap executives -- and we got video proof ... the Biebs singing for Birdman's daughter at her nauseatingly over-the-top sweet sixteen this weekend.
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