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 fans were thrilled for the star when she spent Christmas with her sons after reportedly not seeing the teenagers for two years—and if her latest social media posts are any indication, she's continuing to spend time with at least one of the boys.

Britney Spears is exactly one of those proud mamas, as evidenced by a pair of Instagram clips she posted on Tuesday (March 11) of her youngest, 18-year-old son Jayden James, showing off his piano-playing and mumble rapping skills.