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Katy Perry, Instagram

Instagram

When pop stars collide!

During her London concert this week, Katy Perry got to hang out backstage with one very special fan: Adele!

The "Dark Horse" crooner and the "Someone Like You" singer got to enjoy and little meet and greet and even posed for a selfie together. "And on the 2nd LDN show the Queen graced me with her presence," Perry wrote on Instagram. In the super-cute pic, Adele poses behind Perry in the concert dressing room. Both stars look gorgeous and camera-ready.

Adele also tweeted about hitting Perry's concert, writing, "Katy Perry was supreme tonight! But UK mamas look who I saw tonight!" along with a pic of her posing next to a giant inflatable cartoon character. Too cute.

Perry is currently on her Prismatic World Tour. After her London shows, Perry will take a mini-break before making her way around the U.S. for several dozen shows.