Kris Humphries' lawyers had a telephone conference with FBI agents earlier today, TMZ reports ... and they handed over evidence allegedly proving his ex-flame Myla Sinanaj attempted to extort him.
Kris' camp reached out to the Feds after Myla allegedly demanded a large sum of money in exchange for her silence ... regarding incriminating details about her relationship with Kris.
Sources tell TMZ, Kris' lawyers had the conference with FBI officials in Minnesota this AM and turned over multiple recorded messages from Myla which Kris' people say proves extortion.
A rep for the FBI would neither confirm nor deny an investigation was taking place.
Myla tried to extort him by demanding a large sum of money, or else she'd release damaging information about their relationship to the media.
Lawyers for Kris and Myla were jawboning Friday ... Kris' lawyers were trying to get her to sign a non-disclosure agreement.
As for why they want to muzzle her, sources connected with Myla say she has emails, texts and other documents chronicling their relationship that could hurt Kris if they became public.
Sources connected with Kris say ... Myla threatened that if she didn't get money she would "ruin" Kris. We're told the two sides could not reach an agreement, and that's when Kris' people decided to take it to the FBI.
TMZ Kris sources would not say whether the alleged extortion was in person, over the phone, via email or text, but we're told it is in some electronic form that would give the FBI jurisdiction to investigate the extortion allegation.