Jedward, Kerry and Amy join BB
Kerry Katona, The Only Way Is Essex star Amy Childs, hyperactive X Factor twins Jedward and American Pie actress Tara Reid are among the celebrities who have entered the Big Brother house.
Also inside are Paddy Doherty, of Channel 4's My Big Fat Gypsy Wedding, photo agency boss Darryn Lyons, actor Lucien Laviscount, David Hasselhoff's former wife Pamela Bach Hasselhoff, model Bobby Sabel and Sally Bercow, whose husband John is the Speaker of the House of Commons.
Kerry was the first celebrity through the doors of the house as the reality TV show switched to a new home on Channel 5.
New host Brian Dowling, who won the show in 2001, welcomed viewers with the words: "The waiting is finally over. Your Big Brother is back with a bang."
Kerry, wearing a strapless black dress, told Brian: "I'm shaking like a leaf. I'm really, really nervous."
Glamour girl Amy was the fourth housemate to arrive, wearing a sparkling strapless dress. Brian asked if she had packed her vajazzle kit and was told: "You never know. You have got to wait and see."
Tara, who got married a few days ago, was asked by Brian if this was her honeymoon. "Let find out," she said.
Last to arrive were Jedward - twins John and Edward Grimes - who cartwheeled down the runway.
The fast-talking pair, who represented Ireland in this year's Eurovision Song Contest, wore tiger-print tailed jackets, black leggings and trainers with pandas' heads on as they bounced into the house.
Once everyone was inside, Big Brother ordered one housemate to the diary room. Katona volunteered and was given a secret mission to be chosen as the house's biggest diva in a vote on Friday - or face punishment.