Justin Bieber has written a song about the claims that he fathered child.
The Baby singer is in London to launch his new album Believe.
And, at a playback of the album, he revealed that the drama he went through has inspired a song.
He told Metro: "That girl who said she was gonna have my baby, Mariah Yeater, there's a song about her."
Justin denied claims he had fathered Mariah's son and offered to have a DNA test, but she eventually dropped the paternity case.
The teen star also unveiled a song he wrote for his fans on his 18th birthday at the gig.
"This is a song I wrote for my fans and it's about how they inspired me," Justin said.
"It means a lot to me as I wrote it at 12pm on my birthday," he added.
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