Demi Lovato said she is “a new person with a new life” after her Rock in Rio performance on Sunday night. <br /><br />The 'Sober' hitmaker sang her candid and emotional latest single at the show in Lisbon, Portugal over the weekend, and shared a clip with fans following the concert, which saw her voice crack as she got a lyric about wanting to be a "role model".<br /><br />She tweeted alongside it: "Tonight I took the stage, a new person with a new life. Thank you to everyone who has supported me throughout this journey. It will never be forgotten."<br /><br />
