R Kelly married teen Aaliyah after discovering she was pregnant before bedding her mum, explosive new claims reveal.

Ex lover Lisa Van Allen, who had sex with the disgraced star from the age of 17, says Kelly seduced mum Diane Haughton after he packed charge Aaliyah off to bed.

Speaking to Vlad TV, Allen explained Kelly told her he married Aaliyah in 1994 to save his own skin after discovering she was pregnant with his child.

(Image: VladTV/Youtube)

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She recounts how Kelly told her after Aaliyah got an abortion they annulled the marriage and made a "death do us part" pledge never to speak of their relationship.

"He told me that they were married, that she was pregnant, that he did doctor up the marriage certificate so she could say she was 18, so they could get married, and the reason was if he thought that she was 18 then he couldn't get charged if someone found out she was pregnant.

"This came out of his mouth, I could take a lie detector test to this, this is what he told me. Specifically told me. It's not a rumor, its the truth."

(Image: REUTERS) (Image: VladTV/Youtube)

Allen added Kelly made sure he was also close to Aaliyah's mum - bedding her on the sofa.

She revealed: "He said that when Aaliyah would go to sleep he would go into the living room and they would do sexual acts on the couch while Aayliah was asleep in the bedroom."

Allen isn't the first person to suggest Aaliyah was pregnant when the pair wed in Hawaii.

Former personal assistant Demetrius Smith admitted to helping the Kelly forge the documents he needed to marry Aaliyah.

"I'm not proud of that," he told the camera.

"I had papers forged for them because Aaliyah was underage. [We] got the marriage licence and we were in a hotel in Maywood, Illinois.

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"Aaliyah looked worried, scared. I wanted so much to grab Aaliyah and talk to her. I wanted so much to talk to her because she gave me a look like she wanted me to talk to her…I feel like I failed them, both of them."

He added that at one point Kelly was worried his illegal bride was pregnant - which ties in with what Demetrius wrote in his 2011 book The Man Behind The Man: Looking From The Inside Out.

In the book, Demetrius documented the moment he found out Kelly's concerns.

"'I think she's pregnant,' [Kelly] said, in a voice that sounded as if he wanted to burst out in tears," he wrote.

"'Oh man, Rob,' was all I could say at the time. Derrel McDavid arranged for a car to pick Aaliyah up at O'Hare airport and she had a hotel room available on arrival. This was crazy! How were we going to get through this without causing ill feelings with [Aaliyah's uncle and Kelly's manager] Barry Hankerson?"

Music producer Timbaland contributed to the pregnancy rumours on Mother's Day 2017, when he shared a tribute to Aaliyah - before swiftly deleting it, leading followers to speculate about whether he knew for sure Aaliyah had been expecting a baby at some point.