Photos: Demi Lovato through the years NEW YORK - APRIL 08: Musician Demi Lovato attends her Disney Upfront presentation on April 8, 2008 in New York City. (Photo by Andrew H. Walker/Getty Images) (Andrew H. Walker)
Photos: Demi Lovato through the years NEW YORK - JUNE 11: Actress Demi Lovato attends the premiere of "Camp Rock" on June 11, 2008 in New York. (Photo by Scott Gries/Getty Images) (Scott Gries)
Photos: Demi Lovato through the years LOS ANGELES, CA - SEPTEMBER 07: Singer Demi Lovato arrives at the 2008 MTV Video Music Awards at Paramount Pictures Studios on September 7, 2008 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images) (Frederick M. Brown)
Photos: Demi Lovato through the years HOLLYWOOD - APRIL 02: Actress Demi Lovato and singer Taylor Swift arrive at the premiere of Walt Disney Picture's 'Hannah Montana: The Movie' held at the El Captian Theatre on April 2, 2009 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images) (Alberto E. Rodriguez)
Photos: Demi Lovato through the years LOS ANGELES, CA - APRIL 28: Demi Lovato and Joe Jonas attend the grand opening of Revival Vintage on April 28, 2010 in Los Angeles, California. (Photo by Angela Weiss/Getty Images) (Angela Weiss)
Photos: Demi Lovato through the years HOLLYWOOD, CA - JULY 21: Actress/singer Demi Lovato attends a Live Chat at Cambio Studios on July 21, 2011 in Hollywood, California. (Photo by Alberto E. Rodriguez/Getty Images) (Alberto E. Rodriguez)
Photos: Demi Lovato through the years UNIVERSAL CITY, CA - AUGUST 07: Singer/actresses Demi Lovato (L) and Selena Gomez arrive at the 2011 Teen Choice Awards held at the Gibson Amphitheatre on August 7, 2011 in Universal City, California. (Photo by Jason Merritt/Getty Images) (Jason Merritt/TERM)
Photos: Demi Lovato through the years UNIVERSAL CITY, CA - JULY 22: Singer/actress Demi Lovato arrives at the 2012 Teen Choice Awards at Gibson Amphitheatre on July 22, 2012 in Universal City, California. (Photo by Jason Merritt/Getty Images) (Jason Merritt)
Photos: Demi Lovato through the years TAMPA, FL - DECEMBER 22: Demi Lovato attends 93.3 FLZÂs Jingle Ball 2014 at Amalie Arena on December 22, 2014 in Tampa, Florida. (Photo by John Parra/Getty Images for iHeartMedia) (John Parra)
Photos: Demi Lovato through the years LOS ANGELES, CA - FEBRUARY 19: Actresses Zendaya (L) and Demi Lovato attend the 2nd Annual unite4:humanity presented by ALCATEL ONETOUCH at the Beverly Hilton Hotel on February 19, 2015 in Los Angeles, California. (Photo by Mike Windle/Getty Images for Variety) (Mike Windle)
Photos: Demi Lovato through the years LOS ANGELES, CA - AUGUST 30: Recording artist Demi Lovato performs on the Pepsi Stage, during the 2015 MTV Video Music Awards, at The Orpheum Theatre on August 30, 2015 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images for MTV) (Frederick M. Brown)
Photos: Demi Lovato through the years LOS ANGELES, CA - AUGUST 30: Singer Demi Lovato attends the 2015 MTV Video Music Awards at Microsoft Theater on August 30, 2015 in Los Angeles, California. (Photo by Jason Merritt/Getty Images) (Jason Merritt)
Photos: Demi Lovato through the years LOS ANGELES, CA - NOVEMBER 22: Singer Demi Lovato performs onstage during the 2015 American Music Awards at Microsoft Theater on November 22, 2015 in Los Angeles, California. (Photo by Kevin Winter/Getty Images) (Kevin Winter)
Photos: Demi Lovato through the years LOS ANGELES, CA - FEBRUARY 15: Actor Wilmer Valderrama (L) and singer Demi Lovato attend The 58th GRAMMY Awards at Staples Center on February 15, 2016 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS) (Christopher Polk)
Photos: Demi Lovato through the years LOS ANGELES, CA - SEPTEMBER 22: Recording artists Joe Jonas of DNCE (L) and Demi Lovato perform onstage during the Demi Lovato and DNCE Concert for Marriott Rewards members at JW Marriott Los Angeles at L.A. LIVE on September 22, 2016 in Los Angeles, California. (Photo by Jonathan Leibson/Getty Images for Marriott) (Jonathan Leibson)
Photos: Demi Lovato through the years NEW YORK, NY - SEPTEMBER 24: Singer Demi Lovato attends the 2016 Global Citizen Festival In Central Park To End Extreme Poverty By 2030 at Central Park on September 24, 2016 in New York City. (Photo by Noam Galai/Getty Images for Global Citizen) (Noam Galai)
Photos: Demi Lovato through the years LOS ANGELES, CA - NOVEMBER 19: Demi Lovato attends the 2017 American Music Awards at Microsoft Theater on November 19, 2017 in Los Angeles, California. (Photo by Neilson Barnard/Getty Images) (Neilson Barnard)
Photos: Demi Lovato through the years INGLEWOOD, CA - MARCH 02: Singer Demi Lovato performs at The Forum on March 2, 2018 in Inglewood, California. (Photo by Kevin Winter/Getty Images) (Kevin Winter)
Photos: Demi Lovato through the years WASHINGTON, DC - MARCH 24: Demi Lovato performs "Skyscraper" during the March for Our Lives rally on March 24, 2018 in Washington, DC. Hundreds of thousands of demonstrators, including students, teachers and parents gathered in Washington for the anti-gun violence rally organized by survivors of the Marjory Stoneman Douglas High School shooting on February 14 that left 17 dead. More than 800 related events are taking place around the world to call for legislative action to address school safety and gun violence. (Photo by Chip Somodevilla/Getty Images) (Chip Somodevilla)
Photos: Demi Lovato through the years LAS VEGAS, NV - MAY 20: Recording artist Demi Lovato attends the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images) (Frazer Harrison)
Photos: Demi Lovato through the years LOS ANGELES, CALIFORNIA - NOVEMBER 02: Demi Lovato speaks on stage at the Teen Vogue Summit 2019 at Goya Studios on November 02, 2019 in Los Angeles, California. (Photo by Rich Fury/Getty Images for Teen Vogue) (Rich Fury)