Justin Bieber vows to stay off the booze - for his mum
Most teenage boys would simply hide their boozy antics from their mum.
But Justin Bieber is no ordinary boy.
Now has learnt he's drawn up a sobriety contract to ease his mum Pattie's fears after rumours he's been drinking behind her back.
'Justin's had a pledge drawn up by his attorney vowing not to touch alcohol until he turns 21 and gave it to his mum, copying in his mentor Usher,' says an insider.
'He's always been allowed to come and go as he pleases, but he was worried that stories he's been seen drinking would prompt Pattie to clamp down.'
Justin, 18, has taken a long time to loosen the apron strings.
As Now previously reported, Pattie, 36, was overheard nagging him to brush his teeth on a trip to the UK last year.
Find out more about Justin Bieber in Now magazine dated 24 September 2012 - out now!
SPOTTED: New celebrity pictures of all the stars