Madelyn Cline of 'Outer Banks' shines in a sleek Stella McCartney gown at the 2023 Met Gala. Cline, 25, posed in the glossy black gown with silver accents while attending the event at the Metropolitan Museum of Art on Monday, May 1. On fashion's biggest night in New York City, the Outer Banks singer wore her hair back in a beautiful ponytail in tribute to the late designer Karl Lagerfeld.