Justin Bieber isn't letting baby daddy rumors get him down.

While 20-year-old Mariah Yeater is claiming Bieber is the father of her baby and demanding in court that he take a paternity test, Bieber is brushing off the news.

On Wednesday, he hung out at radio station Power106, and showed off his rapping skills. But, Bieber might have been wiser to rap about something OTHER than his relationships with the ladies. At one point, he said:

    "Get it done abundantly, she wants to get up under me ... I got honeys all up on me, baby I just get it done."


Oh, baby!