Look at me! 22 selfies of the week

Two of the world's biggest pop stars -- Katy Perry, left, and Adele -- appear in a selfie that was posted to <a href='http://instagram.com/p/oj4Oyvv-dG/' target='_blank'>Perry's Instagram account</a> on Wednesday, May 28. It was taken while Perry was in London for her Prismatic World Tour. "...And on the 2nd LDN show the Queen graced me with her presence," Perry wrote.

Two of the world's biggest pop stars -- Katy Perry, left, and Adele -- appear in a selfie that was posted to Perry's Instagram account on Wednesday, May 28. It was taken while Perry was in London for her Prismatic World Tour. "...And on the 2nd LDN show the Queen graced me with her presence," Perry wrote.