A 14-year-old girl named Michaela Wallace is apparently trying to win JUSTIN BIEBER'S affection by releasing her own song on YouTube. It's called "Justin Bieber's Girlfriend" . . . and admittedly it's pretty catchy. The lyrics include the line, quote, "18,000 other girls here, but he'll be lookin' at me. I'll hold up a homemade sign, 'Will you marry me?'" And the chorus goes like this: Quote, "Gonna be Justin Bieber's girlfriend tonight, and we're gonna be dancin' in the moonlight. He'll play my song, then it's love at first sight . . . gonna be Justin Bieber's girlfriend tonight."