Lily Allen is pulling a savage move on Halloween !

The 40-year-old “West End Girl” singer stepped out for Vas J. Morgan and Michael Braun ’s star-studded party on Friday night (October 31) held at the Chateau Marmont Hotel in Los Angeles.

For the party, Lily dressed as Madeline from Ludwig Bemelmans ’ beloved children’s book series, complete with a light blue coat-dress, red necktie, straw hat, and red wig.

The costume is a nod to Lily ‘s new song “Madeline,” in which she seemingly accuses ex-husband David Harbour of having an affair during their marriage.

“We had an arrangement / Be discreet and don’t be blatant / There had to be payment,” she sings. “It had to be with strangers / But you’re not a stranger, Madeline.”

“Who IS Madeline though, actually?” Lily

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