A racially-charged song believed to have been recorded by Justin Bieber has been exposed as a fake.

What She Wants, a new track purportedly sung by the Baby hitmaker, surfaced online earlier this week (ends06Sep13) and drew heavy criticism over its use of the N-word.

The song was immediately taken down by the 19 year old's team, and now editors at Tmz.com report it was actually uploaded by a Bieber imposter.

The prankster is said to have started up a YouTube.com account closely resembling the pop superstar's official page and uploaded the fake track.

The singer behind What She Wants has been named online as Khalil Underwood.