Britney Spears says son Jayden, 18, is a "genius" after he plays the piano for her, adding that she "can't believe he's mine." The singer shares her sons, Jayden and Sean, 19, with ex Kevin Federline.

Proving to be the ultimate proud mother, Britney Spears took to Instagram to praise her "genius" son Jayden while showing off his piano skills. In two posts, the Pop Princess shared videos of Jayden,

The “Toxic” singer posted a clip of the 18-year-old freestyle-rapping while swaying around the foyer of her $7.4 million Thousand Oaks, Calif., mansion.