She started to grab the spotlight when she arrived in a green-eyed Jean-Charles de Castelbajac blue satin dress.
She opened the awards night singing her number one hit "I Kissed A Girl" dressed in an American footballer's kit riding a giant Chapstick.
She was also in a mini pink dress on top of two cherries.
Perry showed her joy at Barack Obama's triumph with a sequinned dress tribute to the new U.S. president, created by French designer Jean Charles de Castelbajac
She sported a pink playsuit with her name pinned on the dress.
She also appeared in a Manish Arora corset dress with a merry-go-round skirt.
She wore a colorful gown while sitting on top of a big banana.
Katy appeared again in another outfit, this time a white one with some yellow on the top and with a big pink bow.
She later changes into a demure baby pink gown.
Katy ended the show with an amazing performance of her latest single "Hot N Cold"! Her gender-confused outfit came with a man's suit on one side and a cute dress on the other.
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