“I cannot wait to play the Greek in LA!!!,” Demi Lovato tweeted in anticipation of her show at Los Angeles’ Greek Theatre on Wednesday night (July 18). The X Factor judge shared a bill with Owl City and Neon Hitch, but she also brought a few surprise guests on stage for her lucky Lovatics. First was a duet with Nick Jonas on “Don’t Forget” (which he co-wrote with the pop star) and “Catch Me”. Next the Unbroken singer announced, ”I have someone very, very close to my heart… She’s very nervous because this is only her second time singing this song,” Demi said as she lovingly introduced her little sister Maddy before the two performed an adorable rendition of “Together”.