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Miley Cyrus, Katy Perry

Landov

Katy Perry did sing, once upon a time, how she kissed a girl and liked it. And Miley Cyrus decided to take full advantage.

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.

Miley Cyrus, Katy Perry

Twitter

Flashback to Madonna and Britney Spears' infamous lip lock, anyone?

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 ," she added, with a tongue emoji icon.

Kendall Jenner, Khloe Kardashian, Hilary Duff, Sarah Paulson and Diane Keaton were also in attendance.

Cyrus' next stop on the tour is in Oakland on Monday.