Super Bowl: A Rare, Behind-the-Scenes Look at Every Big Moment!

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You watched the Super Bowl, now get a glimpse of everything you didn't see. ET's cameras captured all the big moments behind the scenes.

Katy Perry gave a fierce halftime performance that had everyone talking, but backstage she was cool as a cucumber -- high-fiving before the halftime spectacular even as stagehands ran around in total chaos.

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Lenny Kravitz graciously took a selfie with a crew member minutes before facing the crowd, and Missy Elliott played double duty, helping a dancer with his costume.

After the halftime performance, things were even more frantic as Katy was rushed to her dressing room, flanked by security guards.

John Legend helped launch the big game with a soulful rendition of "America the Beautiful," but before he sat down in front of the piano, ET was with the singer's wife, Chrissy Teigen, who had a message for husband.

"Good luck, baby," Chrissy said. "I love you! You're going to be awesome as usual."

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After John, it was Idina Menzel's turn. As she belted out the "The Star-Spangled Banner," our cameras were locked on John and Chrissy as they took in Idina's performance.

"It feels exhilarating!" Idina told ET's Kevin Frazier just moments after her performance. "And the planes flew over with perfect timing," she added, referencing the U.S. Air Force Thunderbirds.

John Travolta, who famously mispronounced Idina's name at the 86th Academy Awards, was also in attendance for the performance.

"She rocked it," he told Kevin. "Everybody did. It was one of the most exciting Super Bowls I've ever been to."

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After the New England Patriots' game-saving interception in the last 24 seconds of the game, ET was there as Pats fan Mark Wahlberg headed to the field to celebrate the win.

"[It's] the greatest thing ever, baby!" Mark told ET.