POPSUGAR Celebrity Katy Perry Slide Picture of Katy Perry in a Red, White, and Blue Polka Dot Dress in London Red, White and Beautiful by Celebrity 9/03/10 0 Shares Like us on Facebook Katy Perry arrived at a radio appearance in London on Thursday in a form fitted polka dot dress. Source: Pacific Coast News Online Read More Katy PerryHot Katy Perry Want Pastel Hair Color? Here's What You Really Have to Do Here Are All the Possible Katy Perry Digs in Taylor Swift's "Bad Blood" Music Video POP 100: Which Hot Musician Is Your Favorite? The Cutest Girlfriend Moments From the Met Gala Get the scoop with our daily newsletter TV Movies Young Hollywood A-Listers Sign up with By signing up, I agree to the Terms and to receive emails from POPSUGAR. 4 years Radio 1!! Katy was in a white room live on camera doing whatever the radio 1 viewers wanted her to do. It was one word! WERID.