Kanye West insists he did NOT cheat on Kim Kardashian with a Canadian model/bartender -- telling TMZ, the woman accusing him of being unfaithful is just out for some easy publicity.

24-year-old Leyla Ghobadi recently did an interview claiming she met Kanye at one of his concerts in July 2012 -- three months after Kim and Kanye began dating. She says Kanye had his security pick her out of the crowd and they went for drinks after.

She claims they later engaged in two sexual encounters -- one while Kim was pregnant -- and that Kanye confessed his relationship to Kim was a sham in order to increase his fan base.

But a rep for Kanye says it's all BS -- telling us, '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.'

The rep adds, 'This is a sad attempt to hurt two people trying to live their lives.'.