Sam Smith and designer Christian Cowan are engaged after three years of dating. Related: Dove Cameron and Maneskin Singer Damiano David Are Engaged After 2 Years Dove Cameron and Damiano David are engaged. Cowan shared that the detail was a nod to the beginning of their romance. The Grammy winner rocked a 52-pound feathered black ensemble which Cowan shared that Smith served as his muse. “This look is a love letter to the king of fashion illustration,” Cowan shared of the design in a May Instagram post.