Charli XCX flashes her boobs in a sheer red dress as she attends a Halloween party with Suki Waterhouse, Winnie Harlow and FKA Twigs

CHARLI XCX celebrated Halloween in a sexy devil costume at the Veuve Clicquot Widow Series party in London Wednesday night.

The Brit singer, 24, showed off her figure in a clingy floor-length sheer red dress — nixing a bra and instead taping crosses over her nipples.

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She teamed the slinky frock with a glittering horned headband and pointed pumps, completing the look with a bright red manicure and sparkling red make-up made to look like blood dripping from her eyes.

Joining Charli at the bash were models Suki Waterhouse and Winnie Harlow, as well as singer FKA Twigs.

Though all three embraced the dark side in all-black ensembles, none appeared to be sporting fancy dress for the occasion.

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Vroom Vroom singer Charli is known for her revealing outfits, and recently told the that she loves having curves.

She said: "I don’t really watch my weight too much.

“I’m into the gym, but more for the outfits."