"The Other Girl" (stylized in all lowercase) is a song performed by American singer-songwriters Kelsea Ballerini and Halsey. It was released to country radio in the United States on April 20, 2020, as the second single from Ballerini's third studio album Kelsea (2020). Ballerini and Halsey co-wrote the song with Ross Copperman and Shane McAnally. It was released to pop radio formats in June 2020.
The track received positive reviews from music critics, who praised the lyrical storytelling and both women's performances. In the US, "The Other Girl" peaked at numbers 19 and 52 on the Billboard Hot Country Songs and Country Airplay charts, respectively. It also reached number 95 on the US Billboard Hot 100 songs chart. For promotion, Ballerini and Halsey performed the song live on the American television show CMT Crossroads on March 25, 2020. The song won a CMT Music Award for Performance of the Year, marking both artists' first award at the ceremony. An alternate solo recording of the song is also included on Ballerini's first remix album, Ballerini.
Chris Parton of Sounds Like Nashville described the song as a "shimmering slice of futuristic country pop". Billy Dukes of Taste of Country wrote that the songwriters "practice exquisite word economy in drawing the setting and plot of this story, plus all the envy, anger, hurt that comes with it". Mike Wass of Idolator believed that "both women have shown extraordinary versatility with previous genre-crossing collaborations", citing "The Other Girl" as an example of the "increasingly blurred line between pop and country."
"The Other Girl" peaked at number 19 and 52 on the Billboards Hot Country Songs and Country Airplay charts, respectively, becoming the first single of Ballerini's career officially promoted to country radio to miss the top 40 on the latter. It also reached number 95 on the US Billboard Hot 100 chart; it received crossover promotion to pop formats, reaching number 18 on the Billboard Adult Pop Songs chart and number 34 on the Billboard Pop Airplay chart.
Ballerini and Halsey performed "The Other Girl" on their episode of CMT Crossroads, which first aired March 25, 2020. The duo then performed the song at the 2020 CMT Music Awards; it won the award for Performance of the Year at the following CMT Music Awards in 2021, marking both Ballerini's and Halsey's first win at the award show.
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