Demi Lovato Supports Christina Aguilera at 'Perfect' Las Vegas Residency Opening Show: See the Pics

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Christina Aguilera and Demi Lovato attend the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018 in Las Vegas.

Demi Lovato lived out every Fighter's dream in Las Vegas on Friday night (May 31) when she not only took in Christina Aguilera's first performance of her new residency, but got to celebrate the headliner's latest achievement with her afterwards.

The two pop titans and collaborators cozied up backstage at Planet Hollywood's Zappos Theater for a quick pic following the opening night of Aguilera's Xperience.

Both Aguilera and Lovato are utterly glowing in the photos, and Lovato -- who's been a longtime superfan of the "Beautiful" singer -- was especially thrilled to share such a special moment with one of her idols.

"The f--king queen herself," she gushed on Instagram. "A PERFECT, perfect show. couldn’t believe it was opening night because it was so smooth, flawless and sounded incredible. I was entertained the entire time and was so bummed when it was over until I was reunited with this beauty."

It sounds like this night out with Xtina was a long time coming for Lovato, too -- she shared the stage with Aguilera at the 2018 Billboard Music Awards, but it's been over a decade since the last time she took in her show. 

"I’m so so happy I got to hug you @xtina," she continued. "haven’t seen you in concert since I was 14 and I can’t believe how much life has changed since then. Honored to call you a friend."

Check out Lovato's pics below.