Britney Spears is a flawless entertainer… even when she's not performing!
While filming an upcoming episode of The Jonathan Ross Show, the darling diva decided to get goofy with the late night host!
Jonathan Ross asked Brit to inhale a big gulp of helium from a balloon, and then sing whatever popular song first popped into her head.
And, luckily for us, the blonde beauty selected none other than Taylor Swift's iconic anthem, Shake It Off!
Ch-ch-check out Britney's HIGHlariously squeaky rendition (below)!