Adam Lambert says he had bags of "fun" whilst performing alongside Lady Gaga.

The 'Applause' star took to the stage at Sydney's Allphones Arena with Queen and Lambert on Wednesday (August 27) for a special collaboration.

They ran through the classic track 'Another One Bites The Dust' as the surprised audience looked on in delight.

Lambert took to Instagram after the show to post a photo on Instagram of himself with Gaga.

He added: "So much fun tonight!"

Gaga herself meanwhile previously said on Instagram:

"Me, Dr. Brian May, Adam Lambert in plain site with the whole gang. #anotheronebitesthedust for this New Yorker #dreamscometrueItellyou."

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Watch clips from the performance below: