Justin Bieber I'm 20 Today And It Really Blows

3/1/2014 7:59 AM PST

Justin Bieber -- My 20th Birthday Really Blows

Justin Bieber -- no longer a teenager -- and to celebrate that he blew out candles on a cake that looks like it was made for child.

Bieber -- or according to the cake, Bizzle -- turned 20 Saturday morning ... and he wasted no time kicking off the celebration.

Wonder if he wished for a better plea deal?