Katy Perry has shared a selfie with Adele on Instagram.

The two singers are good friends and they met up in London at Perry's O2 Arena show on Wednesday (May 28).

The US star took to Instagram to post a photo of the duo together, adding:

"...And on the 2nd LDN show the Queen graced me with her presence."

Adele meanwhile took to Twitter to praise Perry's show, adding a photo of herself with a large figure of a starfish from BBC children's show In the Night Garden.

The mother of one said: "Katy Perry was supreme tonight! But UK mamas look who I saw tonight!"

Next up for Perry meanwhile on her Prism tour is another show at London's O2 Arena on Friday (May 30).