Lily Allen goes braless to show off her surgically-enhanced cleavage as she leads glam at Chanel launch in LA - before surprising guests with West End Girl performance

She has been basking in the limelight since the explosive launch of her album West End Girl in October last year. 

And Lily Allen ensured all eyes were on her on Wednesday evening as she led the glamour at the launch of latest Chanel's Coco Crush jewellery line at the Chateau Marmonth in LA, where she treated guests to a performance. 

The songstress, 40, who has had a long-time affiliation with the French fashion house, looked sensational as she went braless beneath a black gown. 

The plunging black dress was both sexy and elegant, while she paired the look with a volumnious beehive in a nod to her trademark Sixties siren style. 

Also in attendance was Chanel ambassador Gracie Abrams, who is the latest muse for the collection, friend to the stars Derek Blasberg and a slew of fashionistas who watched on from their dinners while Lily sang West End Girl tracks. 

Lily took the little black dress look to a new dimension as she wowed at the bash while flying the flag for the collection with a thick gold Coco Crush chain. 

The halterneck gown featured a low-back to complement the plunging front, while she paired the ensemble with vertigious heels and a Chanel Kelly Vintage Patent Leather Top Handle with Gold Hardware, which markets for around £2.5k. 

After hitting the red carpet, she then took the stage inside the event and treated revellers to a performance, as she belted out her esteemed tracks. 

West End Girl has been used to chronicle the collapse of her marriage to Stranger Things star David Harbour and detailed his affair whilst they were together. 

Actor Daniel Nguyen shared stunning videos of the star belting out Sleepwalking, Tennis, Just Enough, Madeline and Pussy Palace. 

During Pussy Palace, which is about her husband David Harbour's home where he would carry out his affairs, she caught a fit of the giggles. 

 Last year, Chanel officially named Gracie as the muse for the Coco Crush collection, with insiders detailing how she 'is set to bring her signature blend of natural assurance and distinctive attitude to the upcoming campaign'.

She opted for a more pared-back look than Lily, as she wowed in a round neck black jacket with gold buttons and grey trousers and gave a glimpse of her abs. 

As well as posing with Lily, she also smouldered in a picture with musician and model Gabbriette, who layered lace over a long-sleeve white tee. 

While she is still enjoying the spoils of her fashion links, Lily is seemingly cashing in on the success of West End Girl as she has applied to trademark the title of the controversial comeback album.

David, 50, may have to endure yet more reminders of their five-year union.

The Daily Mail's Richard Eden revealed that an application has been entered with the Intellectual Property Office (IPO) to trademark the West End Girl title for what would be a range of clothing, jewellery and make-up.

Other potential product areas listed which the star is considering merchandising are sunglasses, bags and footwear. The proposed title is currently classed by the IPO as being under 'examination'.