The former Pussycat Doll totally stole the limelight at the event, which was held at Curzon Cinema in Mayfair, flaunting her figure in a beautiful form-fitting ensemble.
Nicole looked a million dollars in a black and white snakeskin print dress by Italian designer Ermanno Scervino, which featured a pretty halterneck design along with a keyhole cut-out detail on the chest.
Her frock also boasted a small slit running up the front to flaunt a glimpse of her slender pins, along with a knee-length hemline to help keep things on the right side of sexy.
The 'Run' singer added a slight pop of colour to her otherwise neutral ensemble with duck egg blue pointed heels by luxury designer Crisian London, teamed with a metallic teal manicure and a few silver bangles and dainty rings.
She kept her beauty look chic and sophisticated by styling her brunette locks in a side parting with the lengths sleek and straight, adding smoky black shadow around her peepers paired with a hint of a rosy hue to blend out any harsh edges.
Her brows were perfectly arched and she applied a touch of bronze to her cheeks, finishing with her fave warm nude lipgloss.
But while Nicole posed for pictures at the event, it seems she had to make a swift exit before the film started. She's currently playing Grizabella in Cats the Musical, held at the London Palladium, and had to hotfoot it over for the evening performance!
Taking to Twitter, the starlet wrote: "So happy I could make the premiere for #SelmaFilm - an important film about a great man #MLK & his historical movement that changed America.
"Will have to wait to see it as off to my #catsthemusical performance but wanted to support the film and everyone involved in it. #MarchOn."
What do you think of Nicole's dress? Let us know by commenting below as the best comment across the site each week wins £50!
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!
Got an iPad or iPhone? Reveal Mag is specially designed to fit!
Watch Nicole's video for 'Run' below: