CALUM Best and Jasmine Waltz started secretly flirting by text months before hooking up in the Big Brother house.

The Sun can reveal the couple’s romance started brewing in private, with the pair playing down their relationship in front of viewers in the first days of their arrival.

7 Calum Best and Jasmine Waltz had already started texting before going into the Celebrity Big Brother house Credit: Rex Features

They give into their chemistry tonight when they sleep in the same bed – with Calum’s mum Angie just a few beds down.

It was the result of months of texting after George Best’s son made a beeline for Jasmine last year and took their texts to the next level following his split with Playboy model ex Lindsey Pelas just before going on the C5 show.

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A source said: “Calum and Jasmine have known each other for a while, but kept the extent of their relationship secret.

“Jasmine is completely Calum’s type and he couldn’t wait to see how what they’d started was going to develop in the house.

“They were both shocked when his mum turned up, and Jasmine was on her best behaviour for a while to impress Angie.

7 Sexy Jasmine has kept the extent of her relationship with Calum top secret

7 Reality hunk Calum had made a beeline for Jasmine before the show started Credit: Instagram

7 The loved-up pair have been on their best behaviour in front of Calum's mum Angie Best who's also in the house

“Everyone was watching to see what happened between him and his ex Bianca Gascoigne – but he had his eye on Jasmine the whole time.”

Calum and Jasmine have flirted up a storm since they first entered Big Brother, despite the male model's mother also taking up residence in the house.

The couple shared a kiss last week, but Jasmine upped the ante on last night's episode when she hopped into bed with the star.

The 34-year-old model even brazenly grabbed his crotch in front of the cameras earlier in the night.

Calum had insisted he was no longer a playboy and got upset with Coleen Nolan when she suggested otherwise.

7 The pair have struggled to keep their hands off each other during their first week in the house

7 Their romance could hot up if Angie gets evicted from the house tonight

He told Big Brother: “I’ve worked my a** off to change a reputation that I was stuck with, I’m not that dude, for someone to f**king call me out like that it f**king pissed me off.”

Jasmine initially appeared to be caught in a love triangle with Calum and his friend Jamie O'Hara, but made it clear her affections lay with the tattooed hunk last weekend.

Calum had been dating busty Lindsey since last summer before calling off their romance prior to entering the house.

7 Jasmine initially appeared in a love triangle with ex-footie player Jamie O'Hara and Calum

Meanwhile The Sun told how Calum’s ex Bianca, who he met on Celebrity Love Island in 2006, was also hiding a secret relationship with her cage fighter boyfriend CJ Meeks, despite telling producers and viewers she was single to boost her chances of landing a spot on the show.