The 32-year-old, who is expecting her first child with rapper boyfriend Kanye West, has dated Ray in 2003, reported Sun Online.
The track which is to be released next week contains unsubtle phrases about the then-couple's private life.
The cover for the new single has a blurred picture of Kardashian.
The 32-year-old singer also plans a video, using a Kardashian's lookalike.
After splitting with Ray J, Kardashian dated Reggie Bush and was married to Kris Humphries for 72 days.
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