Sam Smith and Christian Cowan engaged after 3 years of dating

Sam Smith and their boyfriend of more than three years, fashion designer Christian Cowan, are engaged, Page Six can exclusively reveal.

The couple, who attended the 2026 Met Gala together on Monday, were overheard talking about their engagement at the Mark Hotel before walking the red carpet.

Cowan accessorized his black couture Erté-inspired ensemble — which he designed along with the musician’s matching getup — with a massive square yellow diamond ring on that finger, which we’re told is by Cartier.

“From what I understand, it was a private engagement,” our hotel lobby spy told us.

“They are over the moon, and from what I hear, so in love!”

Smith — who identifies as non-binary and uses “they/them” pronouns — later posted about the duo’s outfits on Instagram.

Quoting Cowan, Smith captioned the carousel, “I have always loved Erté. I love the way he brought costume art to the world through his visionary illustrations.

“The infamous 1920s opulence and craft. 255,000 individual crystals and beads. 2,000 hours of artisanal hand sewing. This look is a love letter to the king of fashion illustration, and to my love, Sam.”

The Grammy-winning singer, 33, and Cowan, 32, were first linked in December 2022 when they watched then-President Joe Biden sign into law the Respect for Marriage Act (RMA) at the White House.

The RMA, which repealed the 1996 Defense of Marriage Act (DOMA), ensures federal recognition of same-sex and interracial marriages.

Smith and Cowan — who are both UK natives — have since been photographed engaging in PDA in New York City, accompanying each other to tattoo appointments and attending numerous runway shows.

The two made their red carpet debut as a couple in coordinating attire at the 2024 Met Gala, and also attended the ball together the following year.