Ray J 'takes aim at Kim Kardashian in new single'

R&B star Ray J is courting controversy with a new song apparently about his ex-girlfriend Kim Kardashian.

Ray J, who co-starred in Kardashian's infamous 2007 sex tape, seems to be taking aim at the reality TV beauty in his upcoming single, I Hit It First.

In the track, he reportedly references sexual acts he once engaged in with Kardashian, who is now expecting a baby with rapper Kanye West.

According to TMZ.com, the song includes the lyrics, "She might move on to rappers and ballplayers/ But we all know I hit it first.../ I had her head going north and her a** going south.../ But now baby chose to go West.../ No matter where she goes or who she knows... She still belongs in my bed."

The track is due out on Tuesday (09Apr13) and its cover features a pixelated photo believed to be of Kardashian in a bikini.

Kardashian dated Brandy's younger brother following her failed marriage to producer Damon Thomas, and she is currently locked in a divorce battle with her estranged husband, basketball player Kris Humphries.