The blonde beauty, who previously entered the Celebrity Big Brother house, was seen enjoying a wild night on the town on Thursday.
Bianca hit up exclusive London nightclub Libertine for the launch of new menswear brand DaVinci London.
Dressed in a figure-hugging flasher jacket, the TV star looked hotter than ever as she strutted into the venue.
Featuring a plunging neckline, the outfit allowed B to teased her killer cleavage while keeping her modesty intact.
The starlet completed her look with red heels to accentuate her supermodel pins.
“She then lay on her back and spread her legs wide while the fella got on top of her.”
However, while she perfectly toed the line between sexy and classy on her arrival just a few hours later it was a different story.
The 31-year-old was seen stumbling around the club before slumping on a sofa before getting down and dirty with a mystery man.
A source said: “It was just after 11pm and the event was still in full swing but Bianca only had eyes for one man.
“She didn’t care who was watching… at one point she straddled him before grinding on his crotch on the sofas.
“She then lay on her back and spread her legs wide while the fella got on top of her.
“Bianca was only wearing a short jacket so everything was on show… it was like a live sex show… everyone was shocked.”
Earlier this month Bianca was seen enjoying rare dinner date with her dad Paul.
Previously speaking about the troubled football legend, the buxom babe said: “He’s doing really well.
“He’s looking the best I’ve ever seen him. Honestly, he’s doing great.”
She added to The Sun Online: “It’s hard to get down and see him because he’s in Bournemouth and I work six nights a week.”