The bookies' favourite, looked shocked when her name was read out by the show's host Davina McCall.
Glamour model Sophie Reade, who changed her name to Dogface to compete in the reality show, has won Big Brother 10.
The 20-year-old from Nantwich, Cheshire, saw off competition from "slave to fashion" Siavash Sabbaghpour, 23, to win the prize fund of £71,320.
Earlier, the public voted David Ramsden third, Charlie Drummond fourth and Rodrigo Lopes fifth.
Sophie, who won 74.4% of the final vote, said: "I never thought I would win...I can't believe it."
She said winning made her feel "really accepted".
Early figures suggest 3.1m viewers saw Sophie crowned the winner
"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.
She added she planned to spend her prize money on clothes and give some away to charity.
The remainder of the £100,000 prize fund, which had been taken away after the housemates tried to break out, will go to charity Channel 4 said.
During her 13 weeks in the show, Sophie became known for her relationship with fellow housemate Kris Donnelly, her amusing antics while drunk, her constant eating and subsequent fears over her growing weight and her shaky grasp of geography.
After telling fellow housemates that she thought Africa was a country rather than a continent, Big Brother set her a task in which she had to correctly place 10 countries on a map.
She managed just two, after placing Germany and Japan in Africa.
Siavash left the house in the clothes provided by Big Brother
She initially earned her status as a housemate when she agreed to Big Brother's request to legally change her name to Dogface by deed poll, although the show agreed to let her change it back again several weeks later.
Second-placed Siavash left the house wearing a leotard and high heels as part of a task he had been set to earn £20,000 towards the prize fund.
He was reluctant to discuss his short-lived romance with housemate Noirin Kelly, which the Irishwoman ended when her on-off boyfriend joined them in the house.
But Siavash offered a public apology to his ex-girlfriend for kissing Noirin saying: "I'm sorry. I'm so, so sorry. Things are really weird in the house."
Earlier David, a recycled clothing sorter from Dewsbury, told McCall he was feeling "bloody brilliant" after finishing third.
He said he was thrilled to have made it to the final after joining the show halfway through, as one of five new housemates added in July.
"I have watched every series from day one," he said.
Newcastle customer service advisor Charlie said he was not disappointed to have not won, adding: "I have already won. I have got on the show."
Brazilian student Rodrigo, the first housemate to be evicted from the live final, told McCall he felt his success on the show made him feel accepted by people in Britain.
All the housemates from the series attended the final show
"Everyone knows how much I love this country - I feel that I am British," he said.
Last week, Channel 4 announced that next year's series of Big Brother would be the last on the channel.
Director of television Kevin Lygo said the show "had reached a natural end point" and that it was "time to move on".
The decision follows a sharp decline in the number of viewers watching the show.
The latest series attracted about two million viewers per show - compared with an audience high of eight million in 2002.
Early figures suggest 3.1m people saw Sophie announced the winner during the live final on Friday.
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