The choreographer of Katy Perry's Super Bowl show has defended the routine's now infamous 'left shark'.

The singer performed the half-time slot at the American football event on Sunday (February 1) in Arizona.

One section of the show saw the US star perform in front of two people dressed as dancing blue sharks.

However, the character on the left of the screen appeared to forget the moves and make it up, becoming a viral internet hit in the process.

Choreographer RJ Durell has now told the Hollywood Reporter that the left shark "nailed it" and achieved the remit of "having fun".

He said: "The sharks were given two main objectives. One, perform Katy's trademark moves to the 'Teenage Dream' chorus, which they both did perfectly; and two, to have loads of fun, and bring to life these characters in a cartoon manner, giving them a Tweedledee/Tweedledum-type persona.

"Clearly, that was portrayed with the overzealous shark on the right hitting precise dance moves, while the left shark was playing up the more goofy, fun-spirited sports fan mascot type, who was just happy to be at the Super Bowl.

"We love the laughter and joy this moment has created for the world and think the left shark nailed it! Don't forget…we all have a little left shark in us!"

Durell added that the sharks were played by two of Perry's long-time dancers.

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Watch the sharks dancing below: