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.

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.

Britney Spears recently expressed her admiration for her younger son, Jayden, and his musical talent on social media. This heartfelt post came less than three months after they reunited during the holidays,