Joe Jonas is rocking a new 'do! The 31-year-old singer took to his Instagram Story to show off his updated hairstyle, a platinum blonde buzz cut.The Jonas Brothers singer, wearing a black T-shirt, raises his still-dark eyebrows in the selfie, as he debuts his new cut and color.The pic comes after Jonas and his wife, Sophie Turner, welcomed their first child, daughter Willa, together.Following Willa's arrival, a source told ET that Jonas and Turner's connection has only gotten stronger.«Sophie