While belting out her song Adore You, Miley headed straight for Katy and planted a full-on kiss on her lips, cueing the flashing of camera phones throughout the venue.
Turning to the crowds after, Miley gave her friend's lip lock a glowing report, saying: "I just kissed a girl and I really liked it a lot." See what she did there?
The feeling was clearly mutual as KP took to Twitter to share this giggling pic of the aftermarth.
- Katy Perry (@katyperry) February 23, 2014
And it's not the first time these two have engaged in a PDA – check out this pic of them sharing a friendly smooch in 2008 at the MTV Awards. Move over John Mayer, this pair are clearly in it for the long-haul.
Want to see more of the craziness from Miley's tour? Check out the gallery below.