Lily Allen tells all on the “West End Girl” tour. (Photo: Corwin Wickersham)

When does the circus sideshow of celebrity breakups take the main stage? When the British singer-songwriter Lily Allen comes through town on her “West End Girl” tour, promoting a 2025 album by the same name – on the short list for the most elaborate and highest-profile takedown of an ex-husband in recent memory.

The man with a bullseye on his back is David Harbour. You know him as the gentle giant of a local police chief from “Stranger Things.” Lily Allen knows him as her “sex addicted” partner whose breezy proposal for an open marriage sets off a cascading series of hurt feelings, self doubt, recriminations and, ultimately, separation.

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Allen musters an effective stage plot to communicate her vision of herself as a scorned woman. All the tour action takes place within an elegantly, if minimally furnished living space of a high-priced brownstone – the same one Allen “could never afford” but Harbour was “pushing forward” in the first song on the album.

The singer inhabits the space alone throughout the set, in various states of undress, rotating from bed to couch to fridge and back to the bed again, talking us through the major bullet points of her dissolving marriage in chronological fashion. Allen rarely missed an opportunity to land a bon mot at Harbour’s expense. And where wit was in short supply, an embarrassingly intimate detail about his sexual proclivities would do. Butt plugs, anyone?

Scathing ripostes with feminist uptake, delivered with the authenticity of street parlance rather than op-ed pages and packaged within irrepressible pop anthems, have always been part of Allen’s musical toolkit. “Hard out Here,” “22” and “The Fear” are a few songs from her back catalog that joyously skewer misogyny in society. She’s a character that fascinates on the strength of her persona as much as her music. The “West End Girl” album is a clear nod toward what fans have come to expect.

MGM Music Hall at Fenway hosted Lily Allen on Sep. 4. (Photo: Corwin Wickersham)

If anything was missing in the live performance onstage at MGM Music Hall, it might have been the impish joy. She sashayed from bed to couch to fridge and back again to bed with all the dramatic jouissance of a forced march.

Maybe it was an off night. Maybe the exhaustion of being on the same tour since 2025 has settled in. Maybe participation in such a public simulacrum of her dissolved marriage is starting to feel more like an obstacle to, rather than a cathartic release in support of, healing in the face of traumatic separation. At the close of the night’s final song, Allen made the dramatic gesture of wiping a tear from her eyes, as if the emotion of the confessional had finally caught up with her.

Was it a real tear? Or staged for effect? And why should it matter to us?

Or maybe she’s just entered a new phase in her life with kids, different interests and an acting career she’s trying to get off the ground and she can no longer comfortably inhabit the edginess she cemented in the world’s mind when her album “Alright, Still” broke through in 2006.

There are varieties of musical personalities that simply age out. Hip-hop, a genre that Allen’s music has more in common with than the tween pop idols she’s often toured with, is rife with middle-aged rappers who can’t grow their art beyond the mental and verbal jargon of early adulthood. Fans were aghast when Andre 3000 (Outkast) dropped off the radar for years and reemerged with an instrumental flute album. But he was chasing his creative star. “West End Girl,” an album and tour devoted to confession as fan service, suggests that Allen is not quite ready to chase hers in the music space.

The opening act was a cello sextet playing instrumental versions of Allen’s older hits. The cellists were led by a conductor whose main purpose seemed to be rallying the room into a sing-along to fill the performative void that 2026 Lily Allen could not, or would not, fill herself. The crowd didn’t bite, and used the 75-minute opening prelude (45-minute cello set, 30-minute intermission) to chat loudly and refresh their drinks.

The cello-powered sing-along opening set. (Photo: Corwin Wickersham)