Stage rights to the film were purchased in 2007, and the musical's creative team was assembled by 2013. In 2019, the musical opened at the Adelphi Theatre in London's West End.

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A few years later, the diner has been rechristened “Lulu's Pies” and Jenna, the owner and head chef, is content that her life has finally turned around ("Opening Up (Finale)"). Bareilles recorded her fifth studio album, What's Inside: Songs from Waitress, featuring songs from the musical.

Waitress features an original score, with music and lyrics by American singer-songwriter Sara Bareilles. It was released through Epic Records on November 6, 2015.

After she almost throws up, Becky and Dawn convince her to take a pregnancy test which, to Jenna's dismay, comes back positive due to a drunken night with her abusive husband, Earl (“The Negative”).

Earl comes to the diner and suggests he may make Jenna quit and give up her passion for baking.

Speaking about the release of the album, Bareilles stated that her decision to record an album of the songs came because it "proved impossible for me to imagine handing over the songs to the show before selfishly finding a way to sing them myself." The show garnered generally mixed-to-positive reviews in both runs.

Frank Rizzo, reviewing the Boston production for Variety, wrote: "...making Earl so relentlessly horrible makes Jenna's inability to leave him not just indecisive but something more worrisome... director Diane Paulus fills the production with clever touches – a scalloped pie-crust proscenium, a fluid and easygoing flow and a natural truthfulness in the performances." For the Broadway production, many critics found Bareilles' score and Mueller's performance to be the highlights of the show.

This production debuted in Buenos Aires at the Metropolitan Sura Theatre on April 17, 2019 and featured Josefina Scaglione, Tony award nominee for the 2009 West Side Story Broadway revival, as Jenna (locally translated to Gina). Jenna is a waitress and expert pie baker at Joe's Diner in the American South who imagines tough situations as pie ingredients (“What's Inside”).

She begins another day at the diner with her boss Cal and waitresses Becky and Dawn (“Opening Up”).

Waitress is a musical with music and lyrics by Sara Bareilles and a book by Jessie Nelson.