The Queen and Adam Lambert tour conquered Sydney and the audience was treated to a suprise performance from Lady Gaga. Meanwhile, one reviewer said that the "American Idol" alum is bringing vitality back to the band.

It seemed that Lady Gaga was returning the favor when the band was in the audience during her performance in Perth last week.

The pop star jumped on stage during the Queen and Adam Lambert tour at Sydney's Allphones Arena to perform a duet with the "American Idol" alum for "Another One Bites the Dust." Lady Gaga was wearing something resembling a cat suit emblazoned with golden crowns, according to MailOnline.

She was also wearing a large wig that made her look like Cher, the British tabloid added.

Meanwhile, the Daily Telegraph only has praises for the Queen and Adam Lambert tour particularly the "American Idol" alum's infusing a youthful vitality to the show.

"Lambert's vocal range, youthful energy and stage presence brought vitality to the Queen & Adam Lambert 2014 tour," Catherine Zuill wrote. "While not a reincarnation of former frontman Freddy Mercury, Lambert strutted and sang his way around the stage in a way that would have made Mercury proud."

Two weeks ago, Brian May admitted to VH1 that they thought the Queen and Adam Lambert Tour could be their last as he, along with Roger Taylor, fades from the limelight. He didn't really have much expectation from the tour, but the opposite happened.

Now Queen guitarist Brian May thinks that the band has a future with Adam Lambert on the mic, as they are now thinking about doing ore shows.

"I feel so fortunate to be going out there. I never thought it would happen again. When Freddie went, I thought, 'That's it. We did that. It was a great life. Now, it's time to have a different life', and for years, we didn't try to be Queen in any way," he said.

"I think he's (Lambert) woken us up," Brian May added.