Lily Allen looks sensational in a semi-sheer lace gown as she departs the theatre after her performance in The Pillowman

Lily Allen looked sensational as she left London’s Duke of York’s Theater on Thursday after her performance at The Pillowman.

The 38-year-old singer, who plays Katurian, impressed in a semi-sheer lace dress with spaghetti straps.

She showed off her slim waist with the corseted bodice, before flaring out into a tiered, ruffled skirt.

Lily enhanced her chic look with a pair of light blue diamond earrings and smoothed her blonde hair.

To complete her outfit, the actress increased her height with some clear stiletto heels with glitzy details.

Singer Lily plays the role of Katurian, a writer of disturbingly violent stories who is imprisoned by a totalitarian state.

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

Starring Steve Pemberton, who plays Tupolski, and Matthew Tennyson, who plays Michael, Lily takes on the role played by David Tennant 20 years ago.

The black comedy “examines the artist’s role in society and questions the price we pay for freedom of expression,” according to a synopsis on the play’s website.

Speaking of The Pillowman’s discussions of censorship, Lily said the piece raises many questions about free speech and the internet.

She said, “There’s a little bit of violence in it. She’s an artist and a writer and that’s something I relate to. She certainly pushes boundaries. I could get a lot out of it.’

Lily, who is used to performing as a singer, said she likes the fixed character of the lead role in a theater production.

The black comedy, which is “widely regarded as one of the greatest plays of the past 25 years,” will run at London’s Duke of York Theater until early next month.

Vintage chic: The singer, who plays the role of Katurian, impressed in a semi-sheer lace dress with spaghetti straps

Elegant: She showed off her slim waist with the corseted bodice, before flaring out into a tiered ruffled skirt

Everything in detail: Lily enhanced her chic look with a pair of light blue diamond earrings

That comes after the theater was evacuated halfway through the performance on Wednesday.

Onlookers were escorted outside by security and reported that a fire truck was soon on the scene.

Several ticket holders spoke of their confusion after the play was halted, with one saying, “Lily ran offstage – everyone thought it was a scary part of the play, but it turned out to be real.”

Another tweeted: ‘Right in the middle of a harrowing performance by The Pillowman at the Duke of York’s Theater we were evacuated.

The fire brigade arrived a few minutes later. Why I’m not sure yet, but the spell is broken, I’m afraid.’

A third complained, ‘I’m not joking (sic), I’ve just been evacuated from the pillow man’.

However, the incident was quickly dealt with and the audience was allowed back in when the play resumed.

A theatergoer wrote: ‘Apparently a false alarm. Game on,” while another repeated, “It was a false alarm we’re back in now.”

Glamorous: To complete her outfit, the actress increased her height with some clear stiletto heels with glitzy details

On stage: Singer Lily plays the role of Katurian, a writer of disturbingly violent stories trapped in a totalitarian state

Speak with The suna spokesman for the London Fire Brigade confirmed that they had been called to the scene and that it had been a false alarm.

They stated: ‘Firefighters responded to an automatic fire alarm that went off at a theater on St Martin’s Lane in central London.

The theater was evacuated as a precaution. A crew was present and an investigation showed that there was no fire.

The brigade was called at 3:11 p.m. and at 3:24 p.m. the incident was over for the firefighters. A fire truck from Lambeth fire station arrived on the scene.’