Kanye says he is not cheating on his pregnant girlfriend Kim Kardashian -- and that the woman who says so just wants some free press.

As we reported, 24-year-old Leyla Ghobadi told Star magazine that she met Kanye at one of his concerts in July 2012 -- three months after Kim and Kanye began dating -- and hooked up a couple of times, once after Kim got pregnant. Leyla says Kanye confessed that the relationship was a publicity stunt.

But Ye's reps tell TMZ, "This is a sad attempt to hurt two people trying to live their lives.This most recent attack on Kanye West and his family is totally without merit. It's a blatant attempt by a misguided individual who is clearly seeking publicity, and another in a series of malicious stories drummed up by non-credible 'news' sources."