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.

In the second video, Jayden, now wearing dark shades indoors, walks around mumbling as Britney screams, “Well that was really good! My son just played! Oh my God! I felt it in my bones, and my heart, and my lungs, and my a–, and my throat and my…,” as Jayden appears to complete the thought with “my d–k.”