Britney Spears sings 'Shake It Off' on helium

Oooops she did it again - Britney Spears made us giggle big time.

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Everyone's favourite pop princess is in the UK promoting her new album Glory and popped by The Jonathan Ross Show to play a round of 'Forfeit Tennis.'

Brit lost her game of Forfeit Tennis and had to suck helium and sing her fave song as a result.

She wasted no time woofing down a gasp of helium and belting out a line to Taylor Swift's Shake It Off and it's brilliant!

Who knew Brit was such a T-Swift fan?

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