Lily Allen sparks concern from fans as she shows off her thin frame in revealing dress

Lily Allen has sparked concern from her fans after she showed off her thin frame in a revealing dress.

The British singer, 39, put on a daring display as she stepped out for a party in London on Thursday evening while donning a strapless, sheer Aadenvik gown.

But when she shared images of herself posing in the racy ensemble to Instagram afterwards, many of her devoted supporters expressed concern about her weight.

According to News.com.au, the comment section of her post was flooded with messages from 'worried' users, who begged her to 'look after herself.'

'You’re beautiful but I’m worried, are you OK?' one person asked, per the publication.

'Please look after yourself,' said another. 

Lily has since turned off all comments on the post. 

Fans also took to X, formerly Twitter, to share their thoughts on Lily's physique, with one user writing, 'Way too thin.'

One of the snaps showed the pop star posing for a mirror selfie in the intricate white gown, which she paired with tan underwear, a sparkling belt, and silver Jimmy Choo stilettos.

Another image featured her staring seductively at the camera with her hand on her hip. 

The whimsical dress, which included a boned corset, floral applique, wispy feathers, and a thigh high split, left her shoulders and long legs on full display.

The Smile songstress added a white Tyler Ellis clutch bag to her look and accessorized with a chunky silver ring, an eye-popping bangle, and dangling earrings. 

She swept her red hair back into a high bun and wore striking makeup for the outing.

The star was joined by a host of famous faces for the bash, including singer Ellie Goulding, model Sienna Miller, actress Yasmine Finny, and Idris Elba's wife Sabrina Dhowre Elba. 

Lily previously hit back at body-shamers in 2021, after she received comments about her size on a video she had posted.

When one fan said they had 'never seen her that thin,' the musician insisted that she was at her healthiest.

At the time, she revealed she was 'two years completely sober' and 'exercising every day.'

'Worried about you Lily. I feel like we've grown up together and I've never see you this thin,' the Instagram user wrote.

'Your fans care about you, your health and we love you very much. Please take care dear.' 

Lily replied, 'You've never seen me two years completely sober, not smoking and exercising every day.' 

In response to another message which has since been deleted, Lily added, 'Seriously, where do you get off? You know NOTHING about me or my lifestyle. How dare you.'