Katy Perry's hittin it big. Many people don't like her claiming she can't sing to save her life. That may be true (more so with Ke$ha IMO) but who can ever deny the fact that she knows what to do for people to like her?
Here are 2 animated GIF images that would define why people like this girl... maybe this would help you out too.
GIF from the MTV of California Gurls
GIF from SNL Guesting with Elmo
See what I mean? 
The first GIF was a clip from the MTV of California Gurls. You can check the video out yourself to find that part and maybe repeat it once or twice.
The second GIF is from her guesting on SNL. She wore that Elmo shirt due to the controversy she made when she guested on Sesame Street with popped boobies as she was doing a skit with Elmo. Unfortunately the segment was not aired, and she kind of feasted on that issue by wearing the shirt.
...on another note, here's something to do the opposite effect.