The housemates joined the 10 who moved in last night as the reality show returned to our screens on Channel 5.
They include 26-year-old Ash Harrison, from Manchester, who describes himself as "a younger, better-looking version" of David Beckham and Ashleigh Coyle, from Londonderry, who wants to win so she can give some of the prize money to charity and take her family on holiday.
Other contestants include Chris Wright, an actor from Hampshire, who says he is "obsessively polite" and has gone into the house for the "free rent, to lose weight and I can't afford therapy".
The first night saw Liverpudlian Mark Byron receive a reward of £5,000 within an hour of being in the house after Wolverhampton singer Pauline Bennett was voted to be the "power housemate" and given a "power trip" to choose who to punish and reward.
Bennett, who performed on Kylie Minogue's single Shocked under her stage name Jazzy P, chose to reward Mark and punish Hertfordshire man Matthew Davies.
His punishment was to be completely excluded from the first night of the show, trapped in a glass box until further notice.
Also among the housemates is Helen Wood, who hit the headlines following allegations that she had sex with England and Manchester United star Wayne Rooney while his wife Coleen was pregnant.
The 27-year-old, from Bolton, describes herself as "the class clown" and says she has been celibate for almost a year.
She said: "Let's just say, I've learned a lot about myself from celibacy."
She is joined by Northern Irish journalist Christopher Hall, Essex boy Winston Showan and headhunter Tamara Stewart-Wood, from London.
Also in the house is Glaswegian Danielle McMahon, who insists her career as an underwear model does not clash with her devout Catholicism.
The 25-year-old said she might clash with "liberal girls" who tell vulgar stories and described herself as having "class, flair and charisma".
Other housemates include Californian Kimberly Kisselovich, a Playboy Bunny who also works as a lawyer, and Steven Goode, from Hertfordshire.
The Channel 5 show, hosted by Emma Willis, also features former Celebrity Big Brother winner Rylan, who is presenting the spin-off show Bit On The Side.