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Sixties siren! Brie Larson stuns in mod mini dress at London Film Festival screening of her critically-acclaimed drama Room

Published: 19:31 EST, 11 October 2015 | Updated: 22:43 EST, 13 October 2015

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Room has yet to hit theaters - as it debuts October 16 - but it has already drummed up Oscar buzz for its leading lady Brie Larson.

And on Sunday the 26-year-old star put her best foot forward as she arrived at the drama's screening at the London Film Festival.

She showed off her toned legs in an elegant, mod style dress as she joined director Lenny Abrahamson and screenwriter Emma Donoghue on the carpet ahead of the screening.

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Woman of the hour: Brie Larson looked gorgeous as she arrived for a screening of her critically-acclaimed film Room at the London Film Festival on Sunday

Brie's Sixties style sleeveless, tan mini dress was decorated with a detailed, paisley pattern in white, red, and grey.

The elaborate number, which hit at the actress's mid thigh, also featured a pale yellow embellishment along the sides and neckline.

She coupled the look with a pair of bronze Paul Andrew pumps, and accessorized with dramatic, dangling cameo earrings.

It's a mod world: The actress showed off a bit of 1960s glamour as she hit the red carpet on Sunday

Happy to be here: The blonde beauty showed off a wide grin ahead of her film's London Film Festival screening

Eye-catching: Brie accessorized with a pair of large, dramatic cameo earrings

Her blonde tresses were styled in a side part, and slicked back into a chic updo that complimented the rest of her mod ensemble.

Brie sported a subtle smoky eye, which the 21 Jump Street actress balanced with a soft, pink lipstick.

She showed off a wide smile as she hit the red carpet in London, and stopped to sign autographs for fans.

Balanced: The 21 Jump Street actress showed off a subtle smoky eye and balanced it with a softer, pink lipstick

Sleek: Brie wore her blonde dresses in a side part, and slicked back into a chic updo for the occasion

Fan friendly: Brie made time to sign autographs before heading into her movie's screening on Sunday

The blonde beauty was joined by the film's director at the event, as well as the writer of the novel (and screenplay), and Clare Stewart, the director of the London Film Festival.

Lenny wore a navy blue button down underneath a textured grey jacket as he arrived along with his family.

He also sported a pair of dark blue jeans, and black leather boots as he was seen greeting fans outside of the theater.

In good spirits: The star seemed absolutely thrilled to be promoting the Lenny Abrahamson-directed picture

Close co-workers: The blonde beauty showed off a wide grin as she posed alongside director Lenny

Time to celebrate: Lenny and Brie pulled smiles at the London Film Festival screening of their well-reviewed Room, ahead of its US release on Friday

Clare wore a black shift dress which was embellished with an eye-catching red and pink design across the front.

She coupled the colorful look with a long, red sweater, as well as maroon tights and a pair of red Mary Janes.

Emma also sported a sleeveless, shift dress, opting for a color blocked look of red, white, black, and blue.

She finished off the look with black tights, black leather flats, and a coordinating pair of black gloves for the evening.

Laid-back: Lenny was dressed a bit more casually for the screening, donning a button down underneath a textured grey jacket, paired with jeans and black boots

Showing his appreciation: Lenny also stopped to sign autographs as he arrived at the London Film Festival event

Family man: Lenny's family was there to support him as he celebrated his film

Room follows Ma (Brie) as she tries to use creativity and imagination to create a fulfilling life for her five-year-old son Jack (Jacob Tremblay) as the two are trapped in a shed that she calls Room.

After the mother-son duo escape the boy's eyes are opened as he finally gets to see the outside world.

Room, directed by Lenny and also starring William H. Macy and Sean Bridgers, hits theaters on October 16.

Keeping close: The family cuddled together for a picture as they joined Lenny on the carpet ahead of the screening for his drama which is already getting Oscar buzz

Coming soon: London Film Festival Director Clare Stewart, Lenny, screenwriter Emma Donoghue, and Brie smiled as they posed ahead of the screening of Room on Sunday (which hits theaters October 16)