Hailey and Justin Bieber hit the 2021 Met Gala red carpet together for the first time as a married couple - and to make it even better, they were celebrating their third wedding anniversary.The pair married on September 13 2018 in a courthouse ceremony, and they hit New York's Metropolitan Museum on Monday, with Hailey wearing a strapless black Yves Saint Laurent dress with a risque neckline paired with a diamante choker.Justin rocked a wide-legged suit from La Maison Drew, a new branch of his