Katy Perry sing Rihanna Only Girl (In The World) at Hammersmith Apollo London 17/3/2011

[@ProtectusCZ]

And again, she proved that she CAN sing☺️

[@israelvelasco6158]

Honrando a su amiguísima Rihanna. Honoring her BFF Rihanna.

[@bentleyamor944]

Katy Perry is so amazing and beautiful❤😚

[@adityathakur8670]

Katy iz phenomenal😍😍

[@HRomeuPinto13]

Te amo Katy ❤😍

[@chris5103]

This was absolutely, incredibly amazing. She needs to do more acoustic.

[@dorianmoura3128]

Start at 4:18

[@evans1618]

Goosebumps

[@katyperryphilippines3653]

amazing

[@Win4chalk]

It starts at 4:18.

[@stubbi1001]

love it so beautiful...

[@luzmchavezcom]

amazing