What will James say? Nick Cannon left fuming after producer Stevie J boasts about 'sleeping with his ex Mariah Carey' during TV taping

It was meant to be a harmless rap battle in the name of entertainment on MTV show Wild 'N Out.

However, presenter Nick Cannon was left furious after his guest, music producer Stevie J claimed he slept with his estranged wife Mariah Carey, who is now engaged to billionaire James Packer.

Stevie J, who stars in VH1 reality show Love & Hip Hop: Atlanta, worked with Mariah on her 1997 album Butterfly and produced her No.1 single Honey.

Defending his ex: Nick Cannon was furious when a music producer claimed to have slept with his estranged wife Mariah Carey

Defending his ex: Nick Cannon was furious when a music producer claimed to have slept with his estranged wife Mariah Carey

Clash: Nick (left) fell out with Stevie J (centre) during filming for Wild 'N Out on Wednesday, which included the latter's on/off wife Josaline Hernandez (right)

Clash: Nick (left) fell out with Stevie J (centre) during filming for Wild 'N Out on Wednesday, which included the latter's on/off wife Josaline Hernandez (right)

As the two men and their respective crews faced off in the rap battle segment of the sketch and improv show during filming on Wednesday, things took a nasty turn, according to TMZ.com.

Father-of-five Stevie, 44, alleged he had sex with pop star Mariah not once, but twice.

A fuming Nick, 35, then hit back at Stevie, suggesting he should be more concerned about his relationship with on/off wife Joseline Hernandez, alleging she was sleeping with rapper Rick Ross.

During the segment, America's Got Talent host Nick alleged warned Stevie that 'you'll never work in this town again' due to his connections.

Stormy: Stevie J and his on/off wife Joseline Hernandez, who currently star in their own spin-off reality show Stevie J & Joseline: Go Hollywood

Stormy: Stevie J and his on/off wife Joseline Hernandez, who currently star in their own spin-off reality show Stevie J & Joseline: Go Hollywood

Moving on: Mariah is now engaged to Australian billionaire James Packer

Moving on: Mariah is now engaged to Australian billionaire James Packer

Producers then had to step in to separate the men and diffuse the row.

Nick and Mariah are currently in the process of divorcing following their 2014 split, but have remained friendly for the sake of their twins Monroe and Moroccan.

The pair, who share a 11 year age gap, married in the Bahamas in April 2008 after just six weeks of dating. 

Meanwhile, the pop diva has since moved on and accepted Australian tycoon James's proposal last month following a whirlwind romance.

Neither Nick or Stevie appeared to address the filming incident on their Twitter pages.

The episode of Wild 'N Out is expected to be broadcast on MTV last this year. 

Fresh-faced: Stevie J produced music for Mariah in the late '90s, suggesting claims of their romantic entanglement may have taken place at the time

Fresh-faced: Stevie J produced music for Mariah in the late '90s, suggesting claims of their romantic entanglement may have taken place at the time

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