Mariah Yeater has dropped her lawsuit alleging Justin Bieber fathered her four-month old son.

The woman who accused Justin Bieber of fathering her four-month-old son has dropped her paternity lawsuit.

Mariah Yeater, 20, had alleged she became pregnant with the 'Baby' singer's child following a 30-second romp after one of his concerts in Los Angeles in October 2010 and although Justin - who vehemently denied the claims - had agreed to a paternity test, the suit was quietly withdrawn late last week, according to TMZ.com.

Mariah's lawyers Lance Rogers and Matt Pare have also stopped representing her after Justin's attorney Howard Weitzman warned Mariah they were planning to sue her and her legal representatives for making false claims.

Justin - who is dating Selena Gomez - previously revealed he was happy to take a DNA test to prove his innocence but insisted he would not "waste" his time meeting his accuser face-to-face because her fabricated claims were vindictive.

The 17-year-old pop star said: "All this stuff is dealt with by my legal team. But if they want me to (take a paternity test) then I will."

When asked what he would say to Mariah if he could meet her, he said: "Nothing, I wouldn't waste my time. I guess (she's done this) for attention, but it's not something I am interested in. These people are not worth my thought or time."