CBB news: Frankie Cocozza defends Denise Welch after she exposes Playboy model Karissa's bum

Huge argument erupts in Celebrity Big Brother house

Denise Welch tries to make amends with Karissa Shannon

Last night Karissa Shannon was shown storming into the Celebrity Big Brother diary room and demanding to leave the CBB house before threatening to sue the show.

The Playboy twin's enraged rant was sparked after Denise Welch - who'd been drinking - jokingly pulled down Karissa's trousers to expose her pink thong - and her bottom.

'I'll forgive you tomorrow but I'm pissed [off],' Karissa told Denise, 53, who was astonished by her reaction.

'Bitch! Denise just pulled my pants down,' the 22-year-old told the other housemates. 'She apologised but it's not OK.'

Frankie Cocozza, 19, stood up for Denise and dismissed it as 'just a bit of fun', but this didn't go down well with Karissa.

'I'm done with Frankie's sexual harassment,' she told Big Brother, before saying she wanted to go home.

'I'm going to sue you guys for showing my ass.

'I don't flash my arse, or flash my tits, I feel disrespected.'

Fans of the Shannon twins who were watching the debacle were rather surprised as the girls posed happily for the camera with their buttocks on show during a trip to Mexico.

But the argument spread through the house and WAG Nicola McLean began shouting at Denise and telling her getting topless in the hot tub last week was inappropriate.

'I was a Page 3 girl for a lot of years, and you flash your boobs openly on telly and you're cool with that? I'm not,' ranted Nicola, 30.

But Denise hit back: 'I've had a lot of things I've wanted to say to you in the house.'

Denise went on to criticise Nicola for her decision during an earlier task to have half of her housemates' letters from home shredded so she could read her own.