Demi Lovato, Twitter

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Turns out Demi Lovato is quite the little prankster.

The 21-year-old singer donned a snowman costume and lovingly crashed Little Mix's performance Tuesday night in St. Paul, Minn.

"Tonight's prank for @'s last show on the ...Hehe heart you girls!!!," the pop superstar tweeted, along with a photo of the group on stage.

Lovato, clad in her humorous white ensemble, showed off her moves as she danced along with the British girl group.

Perhaps the inspiration behind the costume came from Olaf, the highly entertaining snowman in Frozen. After all, she did perform a stunning rendition of "Let It Go" from the Disney smash hit.

Cher Lloyd and Fifth Harmony will now join the pink-haired beauty for the rest of her Neon Lights tour, with the next show slated in St. Louis on Thursday.

Demi Lovato

Adam Bettcher/Getty Images

Earlier this week, the former Disney darling took a break from her busy performance schedule and revealed on Twitter that she got four new piercings to celebrate her sobriety.

"Today is my 2nd birthday. I'm 21 years old, but 2 years ago today, I finally started living…I'm so beyond grateful #ItWorksIfYouWorkIt," she wrote.

"Why not celebrate with some new piercings? 4 in one sitting….#whoops!! #sorrynotsorry."

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