According to "Star" mag just before  Christmas, JUSTIN BIEBER got drunk and high AND  performed ORAL SEX on a 22-year-old nursing student for a full hour. Now we all  know that Star Mag isn't the most reliable source but with the Biebs you never  know...

Apparently Justin and Mimi headed to Justin's house, where he "opened up  about his fondness for tattoos and Xanax, as well as his plans to build a hookah  room in the house."

Lol from there that's when it went down.. a source says "Justin surprised her  by saying, 'I want to know if you taste good.'  He started kissing her  cheek and ear and neck and then her whole body."

Justin never took his clothes off, and when he was done, he was done . . .  despite the fact that Mimi was hoping things would go further.

Dirty would date her.