Lily Allen looks glamorous in a semi sheer red dress

Lily Allen looks glamorous in a semi-sheer red dress

Lily Allen showed off her glamorous sense of style on Tuesday when she performed at the Duke of York Theater in London after starring in her new play The Pillowman.

The 38-year-old star looked elegant in a bright red semi-sheer off-the-shoulder dress by Philosophy by Lorenzo Serafini as she walked down the street in the British capital.

Pop star Lily’s garment featured a plunging neckline with ruched detailing at the top of the dress.

The skirt part reached to the floor and was provided with loose ruffles, whereby the fabric was partially transparent.

Actress Lily carried a Christian Louboutin clutch bag in a bolder shade of red as she headed out to the evening.

Glamor girl: Lily Allen, 38, showed off her glamorous sense of style in a red dress at the Duke of York Theater in London on Tuesday after appearing in her new play The Pillowman

Glamor girl: Lily Allen, 38, showed off her glamorous sense of style in a red dress at the Duke of York Theater in London on Tuesday after appearing in her new play The Pillowman

Star quality: The star looked elegant in a bright red semi-sheer strapless dress by Philosophy by Lorenzo Serafini as she walked down the street in the British capital

Star quality: The star looked elegant in a bright red semi-sheer strapless dress by Philosophy by Lorenzo Serafini as she walked down the street in the British capital

With style: Pop star Lily's garment featured a plunging neckline with ruffle detailing at the top of the dress

With style: Pop star Lily’s garment featured a plunging neckline with ruffle detailing at the top of the dress

She opted for a natural-toned makeup palette to emphasize her pretty features and wore her bleached blonde hair slicked back from her face.

Lily was joined by Poppy Delevingne that evening as the two went out to enjoy each other’s company.

Model Poppy, 37, wore a multicolored cardigan which she wore open over a black top.

She opted for a pair of slouchy blue jeans and wore a pair of black heeled shoes.

Socialite Poppy, sister of model Cara Delevingne, carried a black handbag to match her shoes.

After receiving critical acclaim for her West End debut in 2:22 A Ghost Story, Lily has proven she is keen on staying in the world of theater by landing a role in Martin’s first major competitor McDonagh’s award-winning Olivier play takes over.

In a role where Lily covers her face in blood, The Pillowman will only run for a limited time, ending in early September.

The website states: “In a totalitarian state, a writer is being questioned by the authorities over a series of murders that bear similarities to her short stories.” Is this life imitating art, or is it something more sinister?

Fashion focus: The skirt part reached to the floor and was decorated with loose ruffles, whereby the fabric was partially transparent

Fashion focus: The skirt part reached to the floor and was decorated with loose ruffles, whereby the fabric was partially transparent

Looking good: Actress Lily carried a Christian Louboutin clutch bag in a bolder shade of red as she headed out for the evening Striking a pose: Lily loved posing for photos for onlookers as she stepped out

Looking good: Actress Lily carried a Christian Louboutin clutch bag in a bolder shade of red as she headed out for the evening

Natural beauty: She opted for a natural-toned makeup palette to emphasize her pretty features and wore her bleached blonde hair slicked back from her face

Natural beauty: She opted for a natural-toned makeup palette to emphasize her pretty features and wore her bleached blonde hair slicked back from her face

Out and about in the city: Lily looked in good spirits as she smiled in the British capital this week

Out and about in the city: Lily looked in good spirits as she smiled in the British capital this week

Famous friends: Lily was joined by Poppy Delevingne that night as the pair went out to enjoy each other's company

Famous friends: Lily was joined by Poppy Delevingne that night as the pair went out to enjoy each other’s company

Out and about: Model Poppy, 37, wore a multicolored cardigan which she wore open over a black top

Out and about: Model Poppy, 37, wore a multicolored cardigan which she wore open over a black top

“This black comedy, widely regarded as one of the greatest plays of the last 25 years, examines the role of the artist in society and asks the price we pay for freedom of expression.”

Lily is the first woman to take on the lead role of Katurian in the revival of the 2003 play about the novelist held captive by a totalitarian state.

Alongside Steve Pemberton, who plays Tupolski, and Matthew Tennyson, who plays Michael, Lily plays the role that David Tennant played twenty years earlier.

Of the decision to cast a woman in the role, Lily told The Telegraph, “I think that’s going to add to the horror because we’re not used to seeing women get beat up.”

“In that sense, it’s going to be shocking.” I also feel that men don’t necessarily get the same credit for their artistic achievement as women do.”

Staying casual: She opted for a pair of slouchy blue jeans and wore a pair of black heeled shoes

Staying casual: She opted for a pair of slouchy blue jeans and wore a pair of black heeled shoes

To impress: Socialite Poppy, sister of model Cara Delevingne, carried a black handbag to match her shoes

To impress: Socialite Poppy, sister of model Cara Delevingne, carried a black handbag to match her shoes

The Pillowman follows Katurian as she is brutally questioned by authorities after a string of murders bears similarities to her short stories.

This comes after Lily revealed that she has written musical versions of Black Mirror and Bridget Jones’s Diary.

Speaking on BBC Radio, Lily said: “I wrote the musical for Bridget Jones’ Diary and it hasn’t happened yet – maybe one day it will.”

“I also did a stage adaptation of an episode of Black Mirror that was also sold to someone. It just hasn’t happened yet, but the music is done.”

Busy: Lily has been kept busy on stage in Martin McDonagh's play The Pillowman (pictured), having previously made her West End debut in 2:22 A Ghost Story

Busy: Lily has been kept busy on stage in Martin McDonagh’s play The Pillowman (pictured), having previously made her West End debut in 2:22 A Ghost Story