The gorgeous singer stepped out in this strapless pillar-box red dress which boasted an oversized rose corsage on the bodice and a waist cinching belt.
But even though the ruffle number didn't reveal quite as much flesh as her eye-catching Billboard awards gown, Reets couldn't resist flashing a bit of leg thanks to a daring side split!
You know what they say - if you've got it, flaunt it!
The blonde beauty teamed the show-stopping dress with a pair of strappy heels complete with an embellished ankle strap that glittered under the sea of camera flashes.
Rita was seen cuddling up to fellow Brit Sienna Miller at the star studded bash but she was also papped next to Keeping up With The Kardashian's star - and younger sister of Rob Kardashian - Kendall Jenner later on in the evening.
Rita and Rob dated for a brief period but the relationship ended on bad terms. However, it looks like both girls have brushed everything under the carpet as reality TV star Kendall was papped having a friendly natter with our Reets.
Rita turned the glamour up a few notches with a slick of red lippie and large diamond twist earrings that had a gorgeous vintage feel while Kendall rocked a trailing magenta coloured gown by Calvin Klein offset by an original cut-out detail around the waist and a spaghetti style halter-neck strap - beautiful!
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