Katy Perry roars at Super Bowl

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Singer Katy Perry dazzled at Sunday's Super Bowl halftime show in a dizzying performance that featured dancing sharks, a prowling metallic lion and a levitating star that shot sparkles into the Arizona night.

She entered the University of Phoenix Stadium field in Glendale riding the huge, fiery-eyed lion as she sang her megahit Roar while wearing a flame- festooned dress.

Perry, 30, generally does not move much onstage, so she was presented in setups that masked that fact - including among a sea of dancing chess pieces. And she had guest artists who provided her with strategic cover. She performed a brief duet with rock legend Lenny Kravitz, and they sang I Kissed A Girl, one of her first big hits in 2008, during a brief but raunchy performance.

The crowd cheered during the slightly bizarre next segment that saw Perry perform on a desert island set, complete with palm trees and dancers dressed up to look like goofy sharks or beach balls as she sang California Gurls.

The Super Bowl's halftime show has become a must-see event in the middle of the NFL's championship extravaganza. Halftime performances generate massive ratings and, sometimes, unexpected controversy, such as when Janet Jackson inadvertently suffered a "wardrobe malfunction" that saw much of her breast exposed in 2004.

Perry's 121/2-minute performance did not appear to generate any such controversy and the reaction on social media appeared overwhelmingly positive, with many users praising her live singing, dancers and three quick costume changes.

Actress Anna Kendrick wrote via Twitter: "It's official. Katy Perry is magic. All jokes aside, @katyperry your voice tonight was actually unreal."

Rapper Snoop Dogg chimed in, tweeting: "If you were wondering that was me in tha Shark costume!!"

Perry's grand finale was a spectacular rendition of her huge hit Firework. She climbed onto a star-shaped platform and elevated above the football field, cruising around the stadium as fireworks burst around her, to cheers and applause.

Missy Elliott was the star guest of the performance, making a foggy entrance to sing hits including Get Ur Freak On and Work It. The newly svelte rap diva's high-energy number Lose Control was a crowd pleaser.

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