Katy Perry has launched her signature scent called “Purr” at the Selfridges department store in London. The “I Kissed A Girl” singer wore a purple cocktail dress as she posed for photographers holding the cat-shaped perfume. “I’m very happy to present Purr here in London first, foremost,” Perry told fans and shoppers at the launch. The risqué poster for Purr shows the singer dressed in a figure-hugging blue and pink catsuit with tail and cat ears. Katy Perry’s new single “Firework” is out now on Virgin Records/Capitol.