From ArtRave pop diva to Cheek To Cheek jazz chanteuse, Lady Gaga is truly a musical chameleon. And last night, the “Born This Way” singer-songstress delighted an unsuspecting audience with yet another musical switch-up: Glam-rock goddess!

Yesterday, while down under for the Australian leg of her ArtRave, Gaga popped out on stage during the acclaimed Adam Lambert and Queen Tour in Sydney, which has electrifying audiences all over the world this summer. (It makes sense, too — Gaga is named after Queen’s “Radio Ga Ga,” after all!)

Together, the two friends gleefully tore into Queen classic “Another One Bites The Dust” together to the roaring delight of the crowd. “Tonight I felt alive in a way I have not before. I returned to the Radio GaGa mothership to pay homage to my leaders. It was emotional and wild,” Gaga wrote on Instagram. “So much fun tonight! @ladygaga” Lambert wrote on his page.

Check out photos and videos of the surprise duet after the jump, and listen to full audio from the concert right here.

What do you think of the surprise superstar collabo? Let us know in the comments below.