The Dreamgirls actress, who has lost an incredible 80lbs since 2010, was more than happy to show off some skin in her curve-hugging frock, £31.39 from Nasty Gal.
And judging by her fierce look, she must be taking style tips from Rihanna!
Her skin-tight dress featured a raw-cut hemline, spaghetti straps and a grey acid wash finish.
But her daring attire wasn't the only thing turning heads - Jennifer accessorised with a white baseball cap, adorned with eye-watering silver spikes.
She matched her headwear to her handbag with a studded leather number, shunning the heels for lace-up biker boots.
And with her clothes making such a statement Jennifer kept her make-up simple, adding a wash of purple lippy whilst skipping the blusher and mascara.
Spikes, a thigh-split and minimal make-up? She's one fearless lady!
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