Alex & Sierra were an American duo consisting of Alex Kinsey (born September 8, 1991) and Sierra Deaton (born February 11, 1991), who won the third and final season of The X Factor US. They were mentored by Simon Cowell. Their debut album It's About Us was released on October 7, 2014, on Columbia Records. Their EP As Seen on TV was released on September 30, 2016.

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.

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". They continued on to the top 40 and received Simon Cowell as their mentor. 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. The judges praised the duo for putting their own twist on the song. Kelly and Paulina 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. Despite this controversy, the duo made it through to the live shows.

Collect and categorize