A lawsuit has been filed accusing Justin Bieber of fathering a child with a fan—a claim he has strenuously denied.
Mariah Yeater, 20, has filed legal papers stating she had a sexual encounter with the pop superstar on October 25, 2010, following a performance at Los Angeles' Staples Center.
Yeater also claims Justin is the dad of her almost four-month-old son Tristyn Anthony Markhouse Yeater, who was born on July 6.
The documents were filed on October 31, 2011, and Yeater has signed an affidavit, sworn under the penalty of perjury, to support her claims.
Bieber's representative has issued a statement branding her allegations "malicious and false."
The statement issued by the representative to website RadarOnline.com said:
"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."
The "Baby" singer—who has been in a relationship with Selena Gomez since March—has also taken to his twitter account to address the allegation.
He told his fans to focus on his music and directed them to his new Christmas album Under the Mistletoe.
He tweeted: "all the rumors ...the gossip ... Im gonna focus on the positives ... the music."
In the lawsuit, a copy of which has been obtained by America's Star magazine, Yeater, who was 19 at the time, claims she was approached by one of Bieber's security guards at the concert and asked if she wanted to meet the singer and was then taken backstage.
After chatting briefly with him, Yeater claims she and Bieber began to kiss.
And then on the star's suggestion, she claims, she went with him to a "private place where we could be alone."
Once there, he told her "he wanted to make love to me and this was going to be his first time."
Yeater, who is from California, then claims in the court documents that the pair had unprotected sex.