LONDON — Boxer Amir Khan’s fiancée has demanded a showdown with one of his ex-lovers… to find out if he cheated on her.



Brunette Faryal Makhdoom ­requested the meeting with Natalie Fox after growing suspicious of the two-time world champion.



It is believed she discovered text messages between Amir and blonde model Natalie alluding to a fling.



Natalie, 28, claims she spent time with him just two weeks before his ­official engagement to American Faryal in January.



But Amir, 25, insists it happened a year earlier in January 2011.



Now, New York-based student Faryal, 20, wants to know the truth before she marries Amir... and is even prepared to fly to the UK to meet Natalie face-to-face.



For the moment she has chosen to believe Amir — who says he only romped with Natalie before getting together with her.



But she has asked to see what evidence Natalie has of the alleged affair, insisting: “I have every right to know.”



Speaking exclusively to the Sunday Mirror, Natalie said: “I’m happy to meet Faryal and tell her everything that happened. As his bride-to-be she does have a right to know.



“It’s her prerogative as to whether she believes me or not.”



Faryal first confronted Natalie via a series of texts on Oct. 9. She had found ­Natalie’s number in her phone which Amir had also been using to text his former flame. — Agencies