Watch Britney Spears Suck Helium & Sing Taylor Swift

Britney Spears
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Britney Spears on The Jonathan Ross Show in London, England which airs Oct. 1, 2016. 

Britney Spears already has a pretty high-pitched singing voice, but helium takes it to the next level.

During her appearance on the U.K.'s Jonathan Ross Show, Spears takes the Helium Challenge, agreeing to suck helium from a balloon -- don't try this at home, Ross warns -- and sing a song. Instead of choosing one of the tracks from her latest album Glory, which she's been promoting around the U.K. with a series of fun interviews, she picks Taylor Swift's "Shake It Off," squeaking out the title words twice to the audience's delight.

Britney Spears Scores 10th No. 1 on Dance Club Songs Chart With 'Make Me...'

Watch the moment below:

Spears' Glory arrived last month, and lead single "Make Me...," featuring G-Eazy, has so far peaked at No. 17 on the Billboard Hot 100 and marks her 10th No. 1 on the Dance Club Songs chart.