Justin Bieber 'ignoring rumours, focusing on the music'

Teenage pop star Justin Bieber has vowed to remain focused "on the positives" amid unfounded allegations he has impregnated a fan.

Mariah Yeater, 20, has filed a paternity lawsuit against the 17-year-old Baby hitmaker, claiming she fell pregnant with her now-three-month-old daughter Tristyn after they had sex backstage at a concert in Los Angeles.

Justin Bieber's representatives have slammed the allegations and warned that they will use "all available legal remedies" to prove the "malicious, defamatory" claims are false.

And the young singer is determined not to let the tabloid rumours overshadow his work to promote his new Christmas album Under The Mistletoe.

In a series of posts on his Twitter.com blog, he writes, "all the rumors...the gossip....Im gonna focus on the positives....the music... with this album Im giving portion of the proceeds to #charity ... Im trying to help #GIVEBACK... nothing will stop me from that focus. NOTHING...

"Im going to ignore the rumors...and focus on what is real. an opportunity to help by doing what i love. Judge me on the music! Love yall!"

And Justin Bieber is hoping to draw the spotlight away from his personal life to offer one lucky devotee the chance to ring in the New Year with him at a concert in New York.

He adds, "for those asking yes their (sic) is a ticket in some of the #UnderTheMistletoe albums to come meet me on NEW YEARS EVE!!"