Charli XCX made sure all eyes were on her as she arrived at her lavish 31st birthday party at Tenants in Los Angeles on Saturday night.
The pop singer proved she was living a 'Brat Girl Summer' as she opted for a risqué pair of micro shorts .
The British star, whose real name is Charlotte Aitchison, flashed a black bra through a fitted cut-out white T-shirt which she teamed with the eye catching grey underwear.
Charli put on a leggy display for the celebrations in a pair of black knee high boots and accessorised with a matching handbag and sunglasses.
She's been credited with the 'Brat summer' movement - named after her album brat - that sparked a trend defined by party animal antics and being unapologetically oneself.
Charli XCX made sure all eyes were on her as she arrived at her lavish 31st birthday party at Tenants in Los Angeles on Saturday night
She was joined at the star-studded event by a number of pals including Anya Taylor-Joy who looked incredible in a black plunging gown
Meanwhile Rosalia showed off her incredible figure in a black bralette and matching shorts
Charli was joined at the star-studded event by a number of pals including Anya Taylor-Joy who looked incredible in a black plunging gown.
The actress turned heads in the strappy figure hugging number which fell to the floor.
She added inches to her frame in a pair of towering heels and accessorised by layering two long gold necklaces.
Meanwhile Rosalia showed off her incredible figure in a daring black bralette and matching shorts.
The singer added some glamour to her ensemble with a pair of dazzling silver knee high boots and completed her look with a grey baseball cap.
Rosalia seemed in good spirits as she arrived carrying a large bouquet of flowers for the birthday girl.
Meanwhile Addison Rae put on a very leggy display in a pair of blue denim shorts and a colourful strappy tank top.
Leaving her long dark tresses loose, the actress and influencer donned a pair of stylish glasses as she arrived at the party.
Addison elevated her frame in a pair of towering black sandals and opted for a simple gold necklace.
The pop singer proved she was living a 'Brat Girl Summer' as she ditched her trousers in favour of tiny micro shorts
The British star, whose full name is Charlotte Aitchison, flashed a black bra through a fitted cut-out white T-shirt which she teamed with the eye catching grey underwear
Charli put on a leggy display for the celebrations in a pair of black knee high boots and accessorised with a matching handbag and sunglasses
Anya turned heads in the strappy figure hugging number which fell to the floor
She added inches to her frame in a pair of towering heels and accessorised by layering two long gold necklaces
Singer Rosalia added some glamour to her ensemble with a pair of dazzling silver knee high boots
She kept low-key by wearing a grey patterned baseball cap
Rosalia seemed in good spirits as she arrived carrying a large bouquet of flowers for the birthday girl
Scout Willis put on a leggy display in a brown miniskirt and blue blouse as she arrived at the party
The daughter of Demi Moore and Bruce Willis was all smiles as she waved at cameras
Kylie Jenner's BFF Anastasia 'Stassie' Karanikolaou looked nothing short of sensational as she went braless under a plunging black backless crop top.
The influencer teamed the daring glittering top with a pair of shorts and chunky knee high boots.
Stassie was all smiles as she was spotted climbing into a waiting vehicle at the end of the night.
Charli's birthday celebration comes after she confirmed fans suspicions of a collaboration with fellow pop superstar Billie Eilish.
She did so by sharing a sneak peek of the upcoming track to Instagram just hours before its release.
Charli first sent the internet into a frenzy after she shared a mysterious picture of just two bodies with their heads out of the frame.
After asking fans if they could predict the featured guest on the upcoming remix of her song, Guess, off her sixth studio album, Brat, social media users quickly became convinced they had uncovered her latest collaborator's identity.
And it seems they guessed right as Charli confirmed the duo's collaboration will be released at 6pm EST on Thursday (11pm in the UK).
Meanwhile Addison Rae put on a very leggy display in a pair of blue denim shorts and a colourful strappy tank top
Leaving her long dark tresses loose, the actress and influencer donned a pair of stylish glasses as she arrived at the party
The beauty flashed her gorgeous smile and opted for a simple gold necklace
Addison elevated her frame in a pair of towering black sandals
Kylie Jenner's BFF Anastasia 'Stassie' Karanikolaou looked nothing short of sensational as she went braless under a plunging black backless crop top
The influencer teamed the daring glittering top with a pair of shorts and chunky knee high boots
Stassie was all smiles as she was spotted climbing into a waiting vehicle at the end of the night
Lorde turned heads in a strapless black top and white miniskirt as she departed the party
the singer rocked a pair of semi-sheer socked and stylish shoes for the event
As the sneak peek began, Charli donned her signature black shades for a close up shot as she asked the camera: 'Hey Billie are you there?'
A segment of the song then played before the final image saw both Charli and Billie collapsing onto a pile of underwear, a reference to the song's lyrics 'You want to guess the colour of my underwear'.
Confirming in the caption, Charli wrote: 'Guess featuring Billie Eilish - Out at 6pm est.'
Charli XCX is already in the spotlight after her hyper pop-electronic record BRAT has already debuted as the 'most critically acclaimed record of the year' surpassing Beyonce's latest album Cowboy Carter and Taylor Swift's The Tortured Poets Department.
Ranking number one on Metacritic, Charli's new album BRAT glided past Queen B's hit country-pop album Cowboy Carter, which was released on March 29 and is the singer's eighth studio album.
According to review aggregator Metacritic, received 'universal acclaim' based on a score of 92 out of 100 from 11 critics scores.
BRAT is the singer's sixth studio album and the record reportedly evokes and channels the illegal London rave scene where Charli started performing when she was 14 or 15.
According to Charli XCX, BRAT is her 'most aggressive and confrontational record', but also her most vulnerable.
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