Katy Perry is no stranger to multiple costume changes. When she hosted last year's MTV Europe Music Awards, the bubbly pop star donned a whopping 12 different ensembles.

Perry tried the feat again -- albeit with five less looks -- at the 2010 Teen Choice Awards, wearing seven getups aptly themed around teenage stereotypes. (Cue "The Breakfast Club" soundtrack.)

The singer opened the show as her 25-year-old self, performing her new hit single "Teenage Dream" -- which subsequently became the mini-theme of the show -- in tight zebra-print leggings, a pleather-y vest, and shredded T-shirt.

Switching into hostess mode for the first time, Perry hit the stage in a very grown-up striped tube dress by Giorgio Armani.

Then, after being joined by her co-hosts -- the boys of "Glee" -- each young male told Perry his own teenage fantasy, which, of course, figured into her next five costume changes.

First up was the classic cheerleader, which Perry channeled in a full-on squad uniform complete with a "P" on her shirt, gold pom-poms, and a whistle.

Next, the singer entered the stage -- arm in arm with "Glee" star Chris Colfer -- wearing a pink strapless ballgown paired with a "Prom Queen" sash.

Perry soon followed that saccharine dream with an outfit that was more like a nightmare -- a cringe-worthy light denim jumpsuit, pink turtleneck, white socks and high-top sneakers, paired with taped-together glasses and headgear.

Mark Salling, who joined the singer onstage for her geek (not-so-chic) look, looked uncomfortable as Perry spoke to him in a thick lisp and placed his hand in her jumper's pocket.

Perry's next teenage-themed ensemble was a barefoot peace-loving hippie (complete with a bongo, headband, and turquoise cuff by Samantha Wills), which she wore to accept a surf board for her song "California Gurls."

"Well, I look like an idiot," she said half-way embarrassed to be receiving the award in such a ridiculous costume.

The last look of the night for Perry was a Goth/Marilyn Manson-esque getup consisting of fishnet stockings on her arms and legs, a black leather dress and thick platform boots, along with purple lips and a long black wig parted down the middle, all of which she wore to present the final award of the night to the stars of the dark and moody "Twilight" saga.

Which of Perry's costumes is your favorite? Let us know in a comment.

And see how the pop star's many ensembles stacked up to what other stars wore to the 2010 Teen Choice Awards.