Justin Bieber recently drew a mustache on himself because, well, he can't grow one himself -- the only problem ... he chose the oh-so-boring pencil thin. It's okay, Biebs.

Justin Bieber -- Now With Mustache

Sick of the pre-pubescent peach fuzz facial hair, 16-year-old Justin Bieber decided to give himself a mustache last night ... with the help of some black ink. 

Fake it 'til you make it.