It’s often said that the sweetest form of revenge is living a fulfilling life—though doing so with style certainly adds a delightful touch.

Lily Allen embodied this idea perfectly at the 16Arlington x Antony Price Salon Show held in London on Monday. She graced the runway channeling Audrey Hepburn’s memorable character, Holly Golightly, from the classic film “Breakfast at Tiffany’s.”

At 40, the pop sensation, whose recent breakup album “West End Girl” has been lauded by critics since its debut last month, confidently took to the catwalk, cigarette in hand.

Allen dazzled in a strapless indigo velvet gown featuring a daring high slit and a vivid green lining, glimpses of which appeared as she elegantly moved and posed. Her hair was styled in a polished updo, complemented by her trademark feathered bangs, paying further tribute to the legendary Holly Golightly.

This exclusive collection is the fruit of a collaboration between the London luxury label and Antony Price, a revered designer who in his time has dressed icons like David Bowie and the members of Roxy Music during the 70s and 80s.

Allen’s dress was based on a 1981 design that recently sold on 1stDibs for nearly $6,500; the modern-day remake was winkingly called the “Avenge” dress.

Allen’s latest album, her highest-charting in over a decade, chronicles the dissolution of her four-year marriage to “Stranger Things” actor David Harbour, detailing allegations of infidelity and broken trust after she reluctantly agreed to an open relationship.

The couple, who met on the dating app Raya and married in Las Vegas in 2020, split in February.

Commenting on videos of the pop star’s runway debut, many fans hailed the look as yet another in a series of revenge-dress moments.

“Madeline could never,” one fan quipped, referencing the album’s “other woman.”

“As hot as a smoking gun 🚬 ❤️” wrote another.

The “Pussy Palace” singer recently announced she’ll be performing “West End Girl” in its entirety on a 2026 UK theater tour.

She’s also set to appear as a musical guest on “Saturday Night Live” on Dec. 13.