Andy Cohen and boyfriend Kevin Sobieski have made their relationship red carpet official a little over a year into dating. The “Watch What Happens Live” host and his beau made their red carpet debut Wednesday at SiriusXM’s John Mayer concert in New York City. The duo flashed smiles as they posed together, with Cohen wearing a long-sleeve denim button-down layered over a plain white T-shirt and light-wash jeans, while Sobieski kept things casual in a black T-shirt and olive green pants. Cohen, 58, and Sobieski, 42, first sparked romance rumors in early June after they were spotted holding hands while heading to dinner for Cohen’s 58th…
