For the first time in CBB history, the Channel 5 reality behemoth launched with an all-female line-up.
Viewers who watched the launch show on Tuesday night saw eight women, including Coronation Street cast member Amanda Barrie and former Tory MP Ann Widdecombe swap their privacy to enter Britain's most famous house.
But the all-girls together vibe is set to be majorly disrupted tonight when eight men are thrown into the mix.
Footballer John Barnes, Love Island hunk Jonny Mitchell and boybander Shane Lynch are all set to grace the Borehamwood mansion with their presence.
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TV presenter Emma Willis

“I'm working on it!”
Emma Willis
But could we be seeing a last-minute edition added to the CBB house after host Emma Willis let something slip?
Speaking at The Voice press day to a series of journalists, Emma teased that she was trying to get one of the coaches of the ITV singing competition into the house – and it's none other than new face Olly Murs.
The X Factor runner-up has made no secret of being a fan of Big Brother, even tweeting the show on the launch night asking when it was on.
When asked whether he'd even considered heading for the famous house, cheeky Emma replied: "I'm working on it," with a wink.
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Celebrity Big Brother's male line-up has been slammed by fans, with many left divided after controversial comedian Dapper Laughs was one of the men going in tonight.
The Vine star, real name Daniel O'Reilly, came under fire in 2014 for making rape jokes at a stand-up show and telling one female fan she was "gagging for a rape."
He was then widely mocked when he appeared on Newsnight in a turtle neck jumper and gave a mumbled apology in 2014.
Fans took to Twitter to discuss the controversial signing of the "funnyman", with one writing: "If this is true, this is the worst move Channel 5 could make. Promoting 'year of the woman' and then sending in Dapper Laughs."
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CBB's sexiest housemates

Another fan said: "Looks like the show's premise of empowering women in celebration of 100 years since being granted the right to vote was all just lip service."
A third called for a boycott of the show, calling the move "disgusting".
But not everyone was against Dapper entering, with Geordie Shore star Gaz Beadle writing: "If Dapper Laughs goes in there, I might watch it!"
A second fan said: "Definitely gotta watch if this legend is going in!""
Celebrity Big Brother continues tonight at 9pm on Channel 5.