This fluttery red Marchesa gown is truly a work of art, and Katy is one of few people who can actually do it justice.
As if this look isn't enough on its own, Katy accessorized for the technology-themed gala by attaching a Tamagotchi pet to her Prada gown.
Katy looked stunning on the 2016 Grammy Awards red carpet in this figure-flattering Prada number.
Designer Jeremy Scott coordinated with Katy by wearing a matching black sequinned tuxedo himself.
Look closely, and you'll see the "Dark Horse" singer's embellished Jaime Lee Major number is super sheer at the 2014 Aria Awards in Australia.
Does KP's Atelier Versace number from the 2014 MTV Video Music Awards look familiar? That's because Britney Spears sported a very similar dress back in 2001!
Grassy green hair and a floral Suno dress make for a garden-fresh look for the pop star, who attends a press event for Congressional candidate Marianne Williamson.
It's not her typical zany attire, but this sleek black and yellow Versace number an obvious choice for the Grammy-nominated artist at the MOCA 35th anniversary gala.
Fierce! She ditches the stage for the runway at Moschino's Fall 2014 show at NYFW.
Are you really that surprised to see Ms. Katy in a McDonalds-esque Moschino ensemble? We think not!
The "Roar" singer adds interest to her sequined, striped Marc Jacobs midi with gold spiked pumps and a chunky gold belt at the Hollywood Stands Up to Cancer event.
At Elle's 2014 Style Awards, the edgy pop star sports a feminine Vivienne Westwood number to accept her Elle Woman of the Year award.
People either loved or loathed this Dolce & Gabbana gown, but one thing's certain—it won't be soon forgotten!
Posing next to her one-time beau John Mayer, the pop princess looks like, well, a princess in a frothy blue Giorgio Armani gown at the Universal Music Group's 2014 post-Grammys party.
For music's biggest night, Perry wore a beautiful Valentino gown adorned with music notes.
Ms. Perry is shockingly dainty in a sheer peplum number with intricate texture for an appearance in Sydney, Australia.
While in Sydney, Australia, she slips into a flirty Giambattista Valli coat and dress for an appearance on Sunrise in Sydney.
The green-hair songstress makes a bold statement in this dizzying dress during a press conference in LA.
The "Roar" singer rocked the Capital FM Jingle Bell Ball red carpet when she wore a pink leopard print Versus gown with detailed gold safety pins.
At the 2013 American Music Awards, the singer wowed on the red carpet in an Oscar de la Renta dress.
KP gets into the spirit of Nickelodeon's awards show, rocking a lime-green midriff-baring top and printed skirt—along with Prada peep-toe pumps—to go with her blue and purple ponytail.
Yowza! The "Last Friday Night" singer is hot, hot, hot in a metallic Paco Rabanne mini that hugs her curves, Louboutin leather pumps and her blue 'do styled high at the 2012 Echo Awards in Berlin.
At a pre-Grammy brunch, Katy rocks this spring's biggest trend, neon, courtesy of Fausto Puglisi. Fun little piano-key Charlotte Olympia pumps complete her look.
Katy's ensemble at the Miu Miu Ready-to-Wear Fall/Winter 2012 show during Paris Fashion Week is polarizing.