Bieberland, CA -- Sources close to Bieber have disclosed that teen pop star Justin Bieber had sex with an Olsen Twin, however, he is uncertain which one it was.  Bieber noted the Olsen twin as skinny, short, and kind of frigid, which did not help identify which twin he slept with.  Bieber noted he did prefer having sex with "mature" women instead of his teenie bopper fans, citing that they had more experience.