'Salute' beauties Little Mix have vowed to prank Demi Lovato after she played a practical joke on them during their tour of the USA together. 

Speaking to Digital Spy in a new interview, the superstars confessed that Lovato snuck onto their stage one night dressed as a snowman without them knowing it was her inside of the costume so now they want to get their own back. Perrie Edwards explained:

"Oh yeah, what the hell! That was so random. I didn't even know it was her, I was just like 'Who is this weird snowman on stage with us?' She nearly fell off the stage as well. We had no idea, so when it happened we were like, 'ahh'."

When asked if they were able to get their revenge, Edwards added that they didn't, but assured the 'Neon Lights' sensation that it's coming: "No, because it was the last night! We left after that. It was really funny, though. Usually we do pranks on people, and we thought the Americans might not get it - if we do a prank on them they might be offended, so we left it for the tour and she ended up getting us. So watch out Demi - we'll get you back!"

Watch the girls' latest music video here: