@NICHOLE katy perry is selling out tickets of her California Dreams Tour. her album has sold over 5 million in less then 4 months. thats more copies in 4 months then any of gagas, ke$has, and rihannas albums. non of them are racking up #1s like katy is. i kissed a girl is reconized as the 10th best selling single of the 21st century. you wont downsize brits and gagas success, but you have clearly downsized katys.