The female trio entered the house after Jennifer Clark became the third contestant to be voted off the Channel 4 reality show with 89.7% of the vote.
Sexy executive PA Sara, 27, musician and theatre director Belinda, 44, and model and beautician Maysoon, 28, are the new faces.
Sara, 27, who works for music TV station MTV, has become the first Australian to enter the British Big Brother house. She moved to London five years ago on a whim.
Housemates had been speculating about whether newcomers will join them following the producers' decision to throw out Alexandra De Gale and dance teacher Dennis McHugh.
Loud
Sara says she is the loudest person in the office and that the show needs an Australian to mix up the "reserved and shy Brits".
She has never been in love or had a significant relationship. Big muscles do nothing for her and she goes for men who look like they are in a band.
Sara left home at 16, when she was the "archetypal teenager from hell". Her life philosophy is to take every day as it comes.
Theatrical
Belinda, a mother-of-two from Exeter, was raised in East Africa.
She has a BA in jazz voice and vocal performance, and can play the clarinet and piano. She performed at Glastonbury with a theatre company and has appeared naked on stage.
The Green voter is married and home-schooled her two children.
Respect
Maysoon, from Hertfordshire, speaks fluent Arabic and is a Muslim. She has appeared in Sean Paul and Simon Webbe's music videos.
She says: "I think more people should try being nice, have respect, and treat others how they want to be treated."
She shuttles between her mother's, father's, sister's and her ex's homes and dreams of having a place of her own.
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