Lily Allen’s see-through Dior gown might just be the ultimate revenge dress

Lily Allen is airing out her dirty laundry following a very messy and public breakup with her ex-husband, David Harbour.

The “Smile” singer wore the ultimate sheer revenge dress while attending the global premiere of “The Hunger Games: On Stage” in London Wednesday night.

Allen, 40, walked the red carpet in a completely see-through, long-sleeve metallic black knit gown made by John Galliano for Dior in 1999.

The crochet-knit maxi dress featured long sleeves with tiny perforations throughout, allowing her skin to peek through.

The British pop star completed the look with a pair of black low-rise underwear, platform heels and a few glitzy rings; she opted to forgo a bra.

Allen styled her jet-black hair in a messy updo, keeping her beauty look simple with nude lipstick, soft blush and a shimmery eye.

She arrived in London wearing the skintight ensemble just days after flaunting her six-pack abs at the 2025 CFDA Fashion Awards in an ivory lingerie-inspired look from Colleen Allen’s spring 2026 collection.

The Grammy-nominated songwriter entered the American Museum of Natural History in a delicate bralette and silk maxi skirt layered under a coat draped over her shoulders

Allen also showed the “Stranger Things” actor what he was missing in a lacey bustier and panty set while dressed up as the children’s book character Madeline at a star-studded Halloween party earlier this month.

The “F–k You” artist seemingly used her costume choice to throw shade at her ex.

As Page Six previously reported, Allen included a track titled “Madeline” on her new “West End Girl” album, which she released last month.

The fifth song on her album includes lyrics hinting at Harbour’s alleged affair.

The raw and emotional tune features Allen having a conversation with Harbour’s alleged mistress. She asks tough questions like, “How long has it been going on?” and “Is it just sex or is there emotion?”

Ironically, the woman with whom Harbour allegedly cheated was a costume designer, Natalie Tippett.

Allen addressed Harbour’s alleged infidelity in her song “Dallas Major” as well, accusing an ex-partner of living a “double life” in his “P–sy Palace.”

Allen and Harbour, 50, tied the knot in 2020, but they separated after 4 years together this February.