Following Allen's divorce, she began working on new music which saw her writing about things that she had been affected by including the relationship with herself, her children, her ex-husband and substance abuse.

An electropop and electro-R&B album, No Shame takes influence from pop, electro, grime and reggae and features confessional lyrics that discuss the breakdown of Allen's marriage and friendships, maternal guilt, substance abuse, along with social and political issues.

Upon release No Shame was met with generally positive reviews from music critics, who praised the album's mature lyrical content and themes, Allen's artistic evolution, the composition and production.

To promote the album, Allen released three singles including "Trigger Bang" and embarked on the worldwide No Shame Tour.

[4][5] Allen mentioned on the podcast News Roast that she had begun working on a new album, which would mainly deal with herself, her relationship with her children, the breakdown of her marriage, substance abuse, etc.

[8] Allen has described the album as a backlash to tabloids and public discourse about her, saying that it is "taking ownership of [her] narrative and presenting it in musical form".

[11] Upon returning to London and setting up her studio space, Allen began associating with British grime artist Giggs.

Allen stated that she often found it "difficult to articulate how I'm feeling about things, but I do find it easy [to communicate through] the medium of music.

"[13] Allen chose not to work with long time producer Greg Kurstin, as she wanted to be independent and show that she could make a good record without him.

A predominantly electropop, dancehall and electro-R&B album, No Shame takes influence from pop, grime and reggae and features a low key production.

"Lost My Mind" is a sparse mellow dance ballad, with heavy Autotune that discusses the end of a relationship, whilst Allen questions her own sanity after a painful breakup.

[24][25] "Higher" contains elements of dancehall, soft guitar notes and bass switches, whilst lyrically the song is a melancholy relationship drama that starts with an intro performed by grime MC Meridian Dan.

[26] "Everything to Feel Something" details Allen's breakdown and identity crisis during Sheezus along with the bad personal choices she made during that same period of time.

[29] In late 2017, Allen uploaded numerous songs online in preparation for the album, including the track titled "Family Man".

[30] On 12 December 2017, Allen released the album's lead single, "Trigger Bang", featuring British grime artist, Giggs.

[36] The following day Allen was set to visit Good Morning Britain in order to promote the album, but after having an argument with Piers Morgan over gun violence she was cancelled.

"[16] Writing on behalf of The Daily Telegraph, Neil McCormick stated "it is as if one of the saddest albums you will ever hear is masquerading as a set of party hits", concluding that nevertheless, "No Shame should be compulsory listening for every young wannabe who still thinks pop stardom will be a panacea for all their problems.

"[23] On behalf of Consequence of Sound, Zack Ruskin wrote that "with No Shame, Allen has eschewed making an Irish exit from her days as a party girl and instead delivered a eulogy that gracefully buries the past while continuing to seek the sunshine of the future.

"[48] Roisin O'Connor of The Independent stated "No Shame is a return to form in every sense: a confident, well-produced and deeply personal work.

"[1] Maura Johnston of Rolling Stone believed that the album "might sound placid on its surface, but a closer listen reveals that as her sonics have become more gentle, Allen's truth bombs have become even more explosive.

"[52] For The Guardian, Alexis Petridis stated: "It would be a hard listen were it not for the fact that the music is so great: tropical house shot in soft-focus and slow-motion, orchestrated 70s singer-songwriter ballads, every melody and chorus finished to a uniformly high standard.

lauded the album's vulnerability, saying "The lyrics are raw and honest, while still providing catchy pop beats with hints of grime woven through.