On September 1, 2017, Alex & Sierra announced to the media that they had broken up more than a year earlier, and would no longer continue to make music together, but would branch out into their own solo careers.

[4] Alex & Sierra auditioned in New Orleans, Louisiana, making it to the next round after wowing the judges with a sultry version of Britney Spears' "Toxic".

[5] For the Four Chair Challenge, Alex & Sierra took on the John Travolta/Olivia Newton-John classic "You're The One That I Want" from the 1978 musical film Grease.

Kelly Rowland and Paulina Rubio felt the performance was "nice" and said they had "sexiness" to them, while Demi Lovato told them they were one of their favorite acts but questioned the future and their relationship.

[7] For the first live show, Alex and Sierra earned a spot in the top 12 after performing a stripped-down version of the Robin Thicke hit "Blurred Lines".

[8] Kelly Rowland wished it had been a bit sexier and thought it got corny at times, something Simon Cowell disagreed with,[8] praising Alex & Sierra's performance, calling it "original" and "unique".

[10] On the re-vote show, which happened due to a graphics error that nullified the votes, Alex & Sierra sang "Give Me Love" by Ed Sheeran; Cowell afterward said that the performance was "immaculate... ragged and raw.

[13] For Big Band night, Alex & Sierra performed Taylor Swift's hit "I Knew You Were Trouble".

[16] For the semi-final, the public chose "Little Talks" by Of Monsters and Men, which pleased the judges; Kelly said they nailed it, Demi felt they were looking at the winners, Paulina said that they kept coming back stronger and suggested that there was a huge gap in the industry for them, and Simon said they were not just performing - they were making records each week.

The judges felt that Sierra had blossomed during the competition, Alex's vocals were "fricking crazy" and their performance was "perfect.

[21] In an interview after the winner was announced, Simon Cowell revealed that Alex and Sierra received the most public votes every week of the competition.

On September 1, 2017, Alex & Sierra announced via Twitter that they had broken up a year prior and had attempted to continue as friends.

Alex cites Jason Mraz as one of his biggest musical influences, and has seen him live in concert eight times.

[34] Sierra Phương-Thảo Deaton (born February 11, 1991), is a singer, songwriter and dancer, from Philadelphia, Pennsylvania.

[17] Deaton began dancing at the age of two and studied ballet, tap, jazz, hip hop, modern, and more.

[17] Deaton attended The University of Central Florida, studying for an advertising and public relations degree and graduating with honors in 2013.

[36] She has since co-written songs and provided backing vocals for artists, including 5 Seconds of Summer for "Lover of Mine", Gnash for "forgive" and Lovelytheband for "coachella".