Rita knew that ex beau Calvin Harris was due to make an appearance with girlfriend Taylor Swift (who was also wearing white) and chose to show him exactly what he's missing in this flesh-flashing number that revealed the stars shapely thighs, back and tum.
The risky white dress was held together by a number of bronze, sun shaped pins and boasted a plunging neckline complete with a daring thigh split that almost revealed Rita's behind!
Reets also revealed to the paps that she had gone totally commando at the glitzy bash!
Un-phased by a series of potential wardrobe malfunctions the confident star sashayed down the red carpet as though it was her own personal catwalk and teamed the cut-out number with a pair of matching white stiletto sandals for an extra dose of glam.
When it came to her hair and make-up, Reets eschewed her platinum braids for 50s style waves which she paired with a perfectly contoured complexion, sultry copper lids and a signature slick of red lippie.
You can pick up Rita's favourite Rimmel shade for a savvy £5.49 from Superdrug.
The beautiful star joined pals Ed Sheeran, Jennifer Lopez and 50 Cent at the event while expertly managing to avoid her ex-boyfriend!
But despite the air of awkwardness, there's absolutely no doubt that Rita looked smoking! Calvin who?
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