Katy Perry is a Star in Stripes

An exhausted Katy Perry arrived in at the Sydney Airport this morning; the singer was too tired to talk to fans after her long flight, but who could blame her? This weekend, she also had hosting duties at the Teen Choice Awards, and she premiered the video for her new video "Teenage Dream." On top of all this, Katy is preparing for her wedding to funnyman Russell Brand!

OK! VIDEO: KATY PERRY IS EVERY BOY'S TEENAGE DREAM

Katy didn't just host the TCAs, she also performed and won for Choice Summer Hit, for her song "California Gurls!"

While in Australia, Katy plans on performing in Sydney and Melbourne.