The 21-year-old pop star locked lips with her good pal during her Bangerz concert in Los Angeles on Saturday night.
Let's set the scene: Cyrus was performing "Adore You" and in the middle of the song, she bent down to give the "Dark Horse" singer a smooch.
"I just kissed a girl and I really liked it a lot," Cyrus declared after the duo's spontaneous moment, which was captured in this fan's Instagram video. And the blond beauty also made a perfect reference to Perry's smash hit from 2008.
After the show, Cyrus added a snapshot of the two ladies kissing to her Twitter account, along with several lip emoji icons.
Perry was clearly excited for the show and tweeted before the concert, "I hope @ sings Breakout or The Climb tonight please bb!"
John Mayer's ladylove also shared a candid moment following the kiss, featuring Cyrus' mouth wide open and Perry covering her mouth with her hand.
"And after! I adore you added, with a tongue emoji icon.," she
Cyrus' next stop on the tour is in Oakland on Monday.