Somewhere, Bieber and Hugh Grant are high fiving each other...

Various tabloids are reporting that Justin Bieber has been a father for the last three months, thanks to a bit of backstage action with a randomer.

The Bieber has since vehemently denied 'malicious' claims that he has fathered a fan's child. A 20-year-old Californian "woman" has reportedly filed a paternity lawsuit against the singer, alleging that she slept with the 17-year-old backstage after a show in Los Angeles.

According to Star magazine, Mariah Yeater gave birth to a baby boy three months ago and is now seeking financial support from the Canadian star. Selena Gomez will be pleased.

In a statement issued to Us Weekly, Bieber's rep rubbished the claims and pledged to fight the lawsuit. "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."

His rep forgot to also use the term "ridiculous" in his list of there; sure Bieber's baby aids have only just dropped. Just.