Kanye West is under pressure to respond to explosive allegations published in U.S. magazine Star suggesting he has cheated on Kim Kardashian with a Canadian model.

The rapper has been dating the reality Tv star since April, 2012 and they are expecting their first child together later this year (13).

However, their romance is now set to come under intense scrutiny amid allegations from brunette beauty Leyla Ghobadi, 24, that she slept with the rapper twice since he has been with Kardashian - including after the socialite fell pregnant.

The sensational claims have been published by U.S. magazine Star on Wednesday (12Jun13) and reported on the Internet.

Ghobadi tells Star, "This is going to destroy the Kardashian family. It's bad. It's really bad. It's just embarrassing. But if I were Kim and about to have a baby, I would want to know."

Ghobadi claims she first met West when he spotted her dancing during his concert in Atlantic City, New Jersey last July (12) and invited her backstage before heading out to a nightclub for cocktails.

She alleges West asked her to join him in his hotel room that evening and she refused, but when he made the same offer the following night she agreed and they allegedly ended up in bed.

Ghobadi also claims she and West had sex during a later meeting in New York in October (12), but adds, "I was concerned that he was seeing Kim Kardashian."

West has not responded to requests for comment but a representative for Kardashian has denied the report.