Mexican actress Kate del Castillo has bluntly revealed that during the filming for her documentary 'The Day I Met El Chapo' she had sex with Sean Penn, even revealing that she fell for him.

In the Netflix film, the actress describes the Hollywood star seducing her.

'I enjoyed it and don’t regret it I fell my friend, what can I say?', she bluntly says in the documentary.

Speaking on Friday on Good Morning America to promote the documentary, she contradicted herself however, saying: 'I never fell for him, we had sex. Sorry but we are both adults, single, and something was going on but that was it, it was business'.

'He said, "That moment when you touched my chest I knew something would happen between us",' on their way to home to Los Angeles after the pair met the famed drug lord.

She also calls the Oscar winner charming, charismatic and fun in the documentary.

But whatever there was between the two ended when she stormed out a restaurant upon reading a draft of Penn's Rolling Stone article about El Chapo and she hasn't seen the actor since.

Images from 'The Day I Met El Chapo' showing just how close Sean Penn and Kate del Castillo got during the arrangement for both of them to meet the drug king pin

Del Castillo describes how she fell for Penn while dealing as Penn's middle man for the interview with Rolling Stone that would run in the days after El Chapo's capture

The actress says rather than sleeping with Penn, people just assumed she had sex with El Chapo, however in her GMA interview she insinuated that that never happened, adding that she feared being 'raped' by the infamous drug lord during their rendezvous.

When asked why she waited to say something about being intimate with Penn she said: 'Nobody asked me, and it was so stupid they were all thinking I had something to do with El Chapo and nobody asked me and I'm not bragging.'

And while Del Castillo admits she had sex with Penn, she claimed Friday morning that that was it, there was no relationship that followed.

However during the documentary gives their time together more emotional heft than just sex. She explains that what they had went through at the time, after meeting El Chapo, that they did get close.

'When we got back (from meeting him) we were very moved so made sense that something would happen' she says in the three-part documentary.

'I enjoyed it and don’t regret it I fell my friend, what can I say?' she added, contradicting her Friday GMA stance.

Mexican actress Kate del Castillo (left) says she and Sean Penn had sex while she was filming her documentary about meeting El Chapo

The drug kingpin had agreed to be interviewed by Penn in a meeting that was set up by del Castillo. The actress, who had been secretly conversing with El Chapo for months, had gotten Penn involved because she was making a film about the infamous drug lord

But the good feelings did not last.

As Sean kept pushing her to get in touch with El Chapo whenever he needed, she started fighting and yelling at him.

And while she says she wanted to remain on good terms with her famous fling, Penn didn’t show her the final Rolling Stone piece until four days before it was published.

And when he did, she was furious.

She says in the film that the article wrongly makes it seem like she was infatuated with him and claims El Chapo even sent her flowers, which never happened.

Penn showed her the final draft at the famous Sunset Towers hotel in Hollywood, at a table of famous people.

She stormed out and never saw Penn again.

Meanwhile Penn and his team have tried repeatedly tried to block the documentary from going forward.

Penn's team last week fired off a letter to Netflix to pull the film saying 'that blood will be on their hands if this film causes bodily harm,' to their client, according to the New York Times.

Penn is particularly concerned that the documentary, in which he does not appear, implies that it was he who helped authorities at the Department of Justice in their capture of El Chapo.

Del Castillo opened up about sex with Penn during filming of her documentary out on Netflix. They haven't seen each other since she stormed out of a restaurant when shown a draft of his Rolling Stone interview

Del Castillo admits that during filming she felt like she and Penn were in a very delicate situation while meeting with El Chapo, so much so that she felt their lives were in each others hands in the face of the notorious drug king pin.

She also says she was scared for her life when El Chapo escorted her to her room one evening saying she was afraid 'He might rape me or kill me.'

Del Castillo, Penn and two producers met with the drug kingpin back in October 2015 at a secret location organized by El Chapo.

Mexican authorities raided the site soon after they met, but El Chapo had already fled.

Three months later after the meeting, El Chapo was captured during a shootout that killed five of his associates.

Penn's infamous interview was published a day later in Rolling Stone.

El Chapo was extradited to the US in January.

The drug kingpin had agreed to be interviewed by Penn during the meeting that was set up by del Castillo.

Del Castillo, who had been secretly conversing with El Chapo for months as she was planning on making a film about the infamous drug lord.

It was the first and only interview the Sinaloa cartel leader granted after escaping from a maximum security prison through a tunnel just months earlier.