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

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