A while back, when she first emerged from Sweden's pop scene, once covered the Spice Girls' 'Say You'll Be There.' But during her recent show in London, she performed the rework a little differently when Mel C - that would be Sporty Spice - came out to sing along with her.

"Only one show left on my UK tour and it's my biggest ever!!! I'm FREAKING OUT but I try to keep it cool (lol it's not working) SO EXCITED FOR TONIGHT," she posted on Instagram before the show. Watch their duet below.