Lady Gaga made a surprise appearance at London's Moth club on Friday night to play a mini-show during which she performed her brand new single "Perfect Illusion" for the very first time. Wearing silver hotpants and a cropped t-shirt, Gaga made the excited crowd dance, sweat, and sing along to the new tune, which currently sits at number one on the UK iTunes.

"Perfect Illusion" is the lead single from Gaga's upcoming album, due out this year. "The song is about modern ecstasy," Gaga said of the track which she co-produced with Mark Ronson, Kevin Parker, and Bloodpop. "We found our sweet, simple, ragey way of saying it... I get this sick adrenaline rush every time I hear it."

Watch Gaga's first live performance of "Perfect Illusion" below...