Katy Perry’s world domination tour continues, as she was out and about making promotional appearances in London today. This morning INF Daily caught Perry on her way to the Radio One Studios in London, where she stopped to sign autographs and pose for pictures with fans.

One girl even brought a pink guitar, hoping for Katy’s autograph – and she happily obliged. The singer looked stunning in a form-fitting navy blue and white polka dotted dress, accented with a red fabric flower corsage.

Last night we spotted Katy returning to Claridges after pre-recording an appearance on “Chatty Man” in London. Her t-shirt had the word “HAPPY” emblazoned on it in big, bold letters – and her face certainly matched.