Katy Perry had a royal guest in the house for her second London show on her Prismatic tour but it wasn't Prince William or Kate Middleton...it was British songbird Adele!
The "Dark Horse" singer Instagrammed this selfie of her and Adele backstage after her concert in London last night, saying: "...And on the 2nd LDN show the Queen graced me with her presence."
New mom Adele has been laying low since giving birth to her son Angelo, but apparently, seeing Katy Perry in concert was enough to get her out of the house. "Katy Perry was supreme tonight," the 26-year-old "Rumors" singer Tweeted.
Hopefully, Adele's self-imposed hiatus will be over soon. She recently hinted that her third album (presumably named 25) will be out later this year around her birthday.
Adele wasn't the only famous fan of Katy's who caught her British show. Niall Horan and Selena Gomez attended Katy's first London concert.
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Gallery | Katy Perry's Red Carpet Style