Justin Bieber wrote Song about Mariah Yeater

Justin Bieber is opening up about the case of Mariah Yeater, the 20-year-old girl who accused him of fathering her baby.

Justin told reporters in London (via The NY Post), "There's a song about that girl that said she was gonna have my baby, Mariah Yeater. There are songs about things I'm going through. I wrote songs about different situations."

Last weekend Justin Tweeted a video at Mariah, writing, "Dear mariah yeeter ... we have never met ... so from the heart i just wanted to say...." along with a video from the movie Borat.

Justin is currently in London promoting his new single "Boyfriend." He Tweeted, "great listening session today with international press in notting hill. good to finally let people hear some of #BELIEVE."