In a way, you could say Lindsay Lohan brought them together. In 2008, Jeremy Scott brought Lohan—whom he had just dressed for her post-rehab Paper Magazine cover—to an LA event. They were mobbed by fans, paparazzi…and one girl with huge blue eyes and a camera phone. "She walked right up to me; she didn't even notice Lindsay there," says Scott from his home in Beverly Hills, "and she said, 'Hi, I'm a singer and you're my favorite designer. One day, I hope to wear your things onstage. My name is Katy Perry.'"

Fast forward seven years, and Perry is one of the world's biggest pop stars—and one of Scott's closest friends. For tonight's epic Super Bowl Halftime Show, the duo collaborated on four separate stage looks, including evening wear, swimwear, and couture. (Miss America, eat your heart out.) Here, Scott walks us through every outfit with an exclusive behind-the-seams tour of Katy Perry's costumes:

Look One: The Flame Dress

"Katy called me in October, when I was in Milan for the Moschino show. I knew something was up, because she's like, 'Are you home? Can we get together? Because we need to chat.' Then [her id='88b2f276-79dd-4269-9325-b73d27a6e414' loc='L' share='true' expand='true'][/image]

"We had to think about these looks like Russian Nesting Dolls. Four looks on one performer is really pushing it. So we had to figure out how the flame dress was going to evolve into the California Girls look. So that suit was built to fit underneath her first look; we did one fitting just to make sure the bra and panty were smooth underneath. And in rehearsal, we had to get the transition—taking off the flames, putting on the overskirt—to ten seconds. Ten seconds to remove a piece of leather is hard! The zipper can only zip so fast! So along with choreography and music rehearsals, there's basically a fashion rehearsal to make sure it all works.

"But my favorite part of the look, of course, is the beach ball bustier. It's so flirty and it gives the whole look a little wink. And I can promise you, with those beach balls, there is no Deflate Gate going on here!"

Look Three: The Sweatshirt Dress

"Ironically, this look was the hardest to make. It's also the last one we imagined, because once we found out Missy Elliott was going to be performing with her, I was like, 'Katy, you cannot be singing 'Get Your Freak On' in a giant beach ball bikini! We need to step it up.' So we referenced Missy's track suits and came up with this dress. But in rehearsal, it was never oversize enough—when Katy was doing choreography, it would stay up on her hips after she threw her arms up in the air, and it wouldn't slide back down. But then we couldn't make it too big, because then it's not a cute dress, it's like pajamas. So this sweatshirt, which has such ease to it, was the one that kept me up at night! The reason it says 49 on it is because it's the 49th Super Bowl."

Look Four: The Moschino Star Gown

"When you make a gown, it's usually built for the red carpet or the runway—that's how Moschino knows how to do it! So originally, this gown had closures that are perfect for a celebrity at the Oscars, who has to stand for an hour on the carpet, but it's not made for a quick change. So we had to change the zipper, and rehearse the costume change, because its the most complicated one.

"I love this dress because it's a full-on red carpet Barbie extravaganza. She'll have a slit leg and a glamorous element but with the volume turned up to almost cartoon level. I made the dress in holographic silver mylar, and the stars stay afloat with clear wire that jets from the shoulders. And the sequins on this gown—some of them are the size of your whole hand. It's her finale moment—it has to be show-stopping.

"Believe it or not, Katy took all the clothes to Arizona herself. That's probably why I'm so calm—it's done now. I saw David Beckham in my spin class, and he told me he was going—so I know it's going to be amazing!"

Faran Krentcil Editor at Large, ELLE.com "Her beauty and her brain go not together." —William Shakespeare

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