The 20-year-old, who was the bookies’ favourite and the only girl in last night’s live final, looked shocked when her name was read out by the show’s host Davina McCall.

By beating Siavash Sabbaghpour, who polled three times fewer votes than the winner, she won a £71,320 prize fund.

“I never thought I’d win. I didn’t think I’d get on the show, let alone win,” Sophie, from Cheshire, said.

“I’ve never won anything in my life.”

The model, who wears a 30GG bra, told McCall that winning made her feel “really accepted”.

“Because I get my boobs out for a living people think I’m tacky, an airhead and I’ll have no personality.

“I think people can see past that,” she said.

Sophie said she would use her winnings hair extensions, a new flat and “maybe another boob job”.

She also denied she had sex with fellow housemate Kris Donnelly while in the house although the pair were seen sharing a bed.

“I can swear on my Chihuahuas’s lives I never,” she said.

Sophie spent much of her time in the house as Dogface after changing her name by deed poll in a task which gave her housemate status.

The model, who lives with her parents and two older brothers, lived up to the name when she got on all fours and impersonated her pet Chihuahuas, Army and Moo.

McCall said Sophie won £71,320 which had been returned to the prize fund when housemates completed tasks.

The remainder of the £100,000 prize money, which was taken away when the housemates tried to break out, would go to charity, McCall said.

Sophie said she planned to use the money for charity and clothes.

Siavash, 23, an events organiser who was born in Iran but moved to the UK as a child, had threatened to walk out yesterday but later decided to stay for the final day.

Last night, the croaky-voiced runner-up told McCall he had considered leaving to improve Sophie’s chances of winning.

McCall asked him about his feelings for former housemate Noirin Kelly who put the brakes on a romance with him when her ex-boyfriend entered the house. Noirin has revealed she was single again.

“She did nothing wrong,” Siavash said.

He also offered a public apology to ex-girlfriend Laura Cogoni for kissing Noirin.

“I’m sorry. I’m so, so sorry. Things are really weird in the house,” he said.

Third place in this series went to David Ramsden, a recycled clothing sorter and eBay retailer from Dewsbury, West Yorkshire, who told McCall he was feeling “bloody brilliant”.

Customer service advisor Charlie Drummond, from Newcastle, came fourth.

The housemates were not told that Channel 4 had recently announced that it planned to axe the show after the 11th series next summer.