Kris Humphries' lawyers have had a telephone conference with FBI agents over claims his ex-girlfriend tried to extort him.

Apparently the legal representatives handed over evidence proving Myla Sinanaj demanded a large sum of money in exchange for her silence about his relationship with estranged wife Kim Kardashian.

Sources told TMZ that Kris' attorneys had the meeting with officials in Minnesota and produced recorded messages from Sinanaj which proves their point.

However the FBI would neither confirm nor deny an investigation was taking place.

It had previously been reported that Humphries' lawyers were trying to get her to sign a non-disclosure agreement to prevent her discussing his personal life.

Sources connected with Myla said she has emails, texts and other documents chronicling their relationship that could hurt Humphries' divorce court claims if they became public. 

The website reports that the two sides could not reach an agreement as he prepares to allege that his reality TV star ex was fraudulent in their marriage.

The 27-year-old star — who split from Kardashian after just 72 days of marriage last October — had been dating the 25-year-old, whose real name is Fatmire, since meeting at a prominent New York hotel in January.