[lastfm link_type=""]Justin Bieber[/lastfm] now faces one of the biggest challenges in his rise to the top of the music world. A woman named Mariah Yeater is claiming that he is the father of her baby boy who is three months old.  Yeater filed legal paperwork

demanding that Justin take a paternity test to “scientifically confirm” that he is the father.  She is also seeking “adequate support for my baby.” It’s about to get all Maury Povich up in here. Yeater said in a signed affidavit that she met the singer backstage after Bieber’s October 25th, 2010 concert at Los Angeles’ Staples Center. Yeater also said: “Immediately, it was obvious that we were mutually attracted to one another, and we began to kiss.” The Staples Center is a particularly romantic spot for the Bieb: He recently rented out the entire arena so he and girlfriend Selena Gomez could watch Titanic together.  Meanwhile, Bieber’s reps were quick to respond to Yeater’s allegations: “While we haven’t yet seen the lawsuit, it’s sad that someone would fabricate malicious, defamatory, and demonstrably false claims. We will vigorously pursue all available legal remedies to defend and protect Justin against these allegations.”