Demi Lovato

Demetria Devonne "Demi" Lovato (born August 20, 1992) is an American singer-songwriter and actress who worked with Simon Cowell as a judge for two seasons (2012-2013) on the American version of The X Factor.

Career
Lovato first gained fame when she starred in the Camp Rock movies on the Disney Channel opposite the Jonas Brothers. She then starred in her own Disney series Sonny with A Chance and even co-starred with her good friend Selena Gomez in the Disney Channel movie Princess Protection Program.

As a recording artist, Lovato has released four albums and has had multiple hits, her biggest ones being "Skyscraper" and "Give Your Heart A Break" off of her 2011 album Unbroken and "Heart Attack, which is off of her 2013 album Demi. She also made a return to acting when she took on a guest-starring role on the hit TV show Glee.

X Factor (American version)
Lovato joined the show in 2012 along with fellow pop star Britney Spears as one of two replacements for judges Paula Abdul and Nicole Scherzinger. Critics and fans praised Lovato for her honesty in her critiques but felt that she came up short as a mentor with her highest-placing contestant being season 3's Rion Paige, who came in 5th place.

Lovato and Simon Cowell often tended to tease each other, but when season 3 rolled around, some fans noticed that the once good-natured teasing had become insulting with one often saying something rude to the other. Some suspect that may have led to Lovato leaving the show.

Lovato left the X Factor on December 17, 2013 to focus on her music career.

Tour
Lovato hit the road for the Neon Lights Tour during most of 2014. Fifth Harmony, Cher Lloyd, and Little Mix got to open for her. The tour kicked off in Vancouver, Canada on February 9, 2014. Cowell sent a good luck message to her on Twitter.