Singing Obama comes in THREE different flavors: Bieber, LMFAO, and Carly Rae Jepsen!

Everyone! Please give a warm round of applause for Amanda Bieber, our reigning troll champion.

A Justin Bieber fan covered her idol's "Boyfriend," while adding some lyrical twists of her own. Whether she's joking or not, her creepy wide-eyed stare will probably make guys swear off of dating for life.