The TV personality, 61, dressed to impress for the charity event in the figure-hugging plunging gown as she joined a slew of other stars in attendance.
The beauty oozed confidence as she smiled for the camera and playfully posed in a number of different ways.
She accessorised her bold number with a simple silver bangle and donned a brooch of the breast cancer ribbon.
Vanessa wore her long blonde tresses down and let them cascade past her shoulders in loose waves.
The TV host, 46, posed up a storm in the stunning number which glistened elegantly under the lights.
She added statement earrings to the look as she beamed alongside Vanessa.
Meanwhile actress Amanda Mealing wowed in a corset style top with straps that seductively fell down past her shoulders.
The daring top boasted sexy side cut-outs which flashed her midriff and she paired the piece with a black maxi skirt.
The Holby City star turned up the heat by opting for a green coloured turban with floral detailing, which she matched with a silk scarf that she effortlessly wore around her arms.
She finished her look with a clutch and pointed heels, the same champagne colour as her top.
Also in attendance was Olympian Denise Lewis who showed off her athletic figure in a multi coloured pleated dress.
Former Olympic gymnast Jacquie Beltrao turned up in a beige mid length dress and pointed heels.
The outing comes after Vanessa revealed in September she had lost two stone in weight from a ‘broken heart diet’ since splitting from her cheating ex-fiancé Ben Ofoedu.
After appearing on Good Morning Britain and being told she looked ‘amazing, Vanessa told presenters Ranvir and Ed Balls: ‘Well this is the broken heart diet, I don’t recommend it, no one should have this.’
In addition, the TV personality recently admitted she ‘hasn’t eaten in months’ after Ben ‘broke her heart’.
Reflecting on the split as she appeared on Celebs Go Dating, the star claimed her weight loss has been a ‘silver lining,’ of the upset.
Speaking to Woman magazine, she reflected on her heartbreak and detailed how she hope’s the show will restore her confidence.
She said: ‘I haven’t eaten in months as I’ve been so heartbroken. That’s the silver lining from a broken heart.’
Vanessa continued: ‘I don’t know if I’m on my A game. I think I look ok. I hope some other people might think so. I’ve had a chequered career in terms of my weight but that’s under control.
‘Instead of being grateful that a man flickers his eyes in my direction. I’d like to reach a level of confidence where I think, ‘I’m glad you’ve chosen me but you’re not right.”