The singer is currently preparing to release 'Elephant' on March 11. The track will serve as the lead song from her second studio album, due out later this year.
Burke performed the stripped-back rendition of her new single exclusively for That Grape Juice TV's The Splash and will include a studio version as a B-side to the original.
The X Factor winner recently told Digital Spy that there will "most definitely" be some ballads on her new album.
However, she added that "the main focus is uptempo" as she "can't stand on stage for too long as [she] likes to dance".
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Watch Alexandra Burke perform an acoustic rendition of 'Elephant' below: