Katy Perry roars at Super Bowl halftime show

Singer Katy Perry performs during the Super Bowl XLIX Halftime Show at University of Phoenix Stadium in Glendale, Arizona. Photo/Getty

She started by riding a giant mechanical lion. Then she danced with sharks, and twerked around Lenny Kravitz. Finally, she introduced a fired up Missy Elliott and ended by riding a giant firework around the stadium.

Yes, Katy Perry did not disappoint during her Super Bowl Half Time show.

The chart-topping pop star worked through a medley of her hits during the 12-minute show, kicking off with Roar, running through Teenage Dream and I Kissed a Girl, and ending with Firework.

She kicked off her performance by wearing a dress with a flaming design as she rode a massive metallic lion into the field.

She then took the stage with backup dancers dressed as chess pieces before Kravitz arrived with his electric guitar to accompany the superstar on I Kissed a Girl.

And while the giant tiger was something of a scene-stealer, Perry's seemingly impossible quick changes caused the biggest stir.

She went from colourful costume to extravagant outfit in the blink of an eye - leaving many questioning how she did it.

"Katy Perry just ruined it for all woman. She changed in public in 10 seconds. You have no excuses now," @AdiVerb tweeted.

"Halftime drinking game: take a shot every time Katy Perry changes" @LifeWithAlcohol tweeted.

Feedback about Perry's performance was swift and positive.

Decision made: I'm trading my car in for the giant mechanical lion. #KatyPerrySuperBowl

— Abby Law Smyers (@AbbySmyers) February 2, 2015

Ok. #KatyPerrySuperBowl was great but @MissyElliott Killed it !!! Very entertaining

— Yolonda Ross (@YolondaRoss) February 2, 2015

Fair play. I'm not a fan whatsoever but Katy Perry nailed that. #SuperBowl

— Jeremy Elwood (@JeremyElwood) February 2, 2015

Best super bowl show in very long time! @katyperry #SuperBowl49 pic.twitter.com/Igb6B6grf4

— Angie (@rebel4ever) February 2, 2015

Earlier, Perry had promised to "melt faces" with her half time show.

"It's going to be wild out there," she said.

"I'm creating three or four different worlds ... I have to keep some surprises but I'm very, very excited about this guest.

"I thought long and hard about it. People are not going to expect it.

"It's a throwback of sorts that definitely needed some shine. All I can say is that it will be female fun night but when this person enters the stage faces will melt.

"There will be some faces melted when she steps on the stage."

- nzherald.co.nz with agencies