Video: Britney Spears' Niece Sings 'Femme Fatale' Song

Watch a mini version of Britney perform Up N' Down'.

Britney Spears shared this super cute video on YouTube of her sister Jamie-Lynn's little girl doing a Brit.

"OMG! Check out my niece Maddie covering Aunt Britney's Up N Down," Britney posted.

Brit's version of the 'Femme Fatale' album track has not been released as a single, with the next rumoured release said to be 'Inside Out'.

Check out Britney's niece performing her rendition of the 'Up N' Down' below.

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