Popsugar Celebrity Celebrity Friendships Demi Lovato at Christina Aguilera Vegas Concert Photos 2019 Demi Lovato Was the Ultimate Superfan at Christina Aguliera's Concert: "Keep It Up Queen" 3 June 2019 by Brea Cubit First Published: 1 June 2019 View On One Page Photo 1 of 22 ADVERTISEMENT () Start Slideshow View this post on Instagram Demi Lovato having a BLAST at Christina Aguilera’s show in Vegas tonight !!! #xtina #xtinaaguilera #christinaaguilera #demilovato #demi A post shared by jpasc24 (@jpasc24) on Jun 1, 2019 at 1:55am PDT Share This Link Copy ← Use Arrow Keys → 1 Previous Next Start Slideshow Celebrity FriendshipsCelebrity InstagramsDemi LovatoChristina Aguilera