The Big Bang Theory alum, 37, wore a purple dress, while the Ozark star, 40, sported a white suit and black bow tie.
Cuoco is nominated for Best Actress in a Musical or Comedy for her role as Cassie Bowden in The Flight Attendant.
The couple recently celebrated their baby girl when they hosted a lavish baby shower in early January. "💓Last night we got to celebrate our future unicorn surrounded by incredible friends, family & animals in the most magical environment…thank you to the very special group of people who made it a night we will all remember for the rest of our lives 💓," the blonde beauty gushed.
Chelsea Handler added, "Congrats, Kaley!!!! You deserve all the happiness!"
The actor previously discussed how he was feeling about becoming a father for the first time. "It's the most incredible thing. Very blessed… Very fortunate… Very lucky… Everybody's healthy. It's a beautiful thing," he said.
The couple first met at the 2022 premiere of Ozark — and they immediately realized they had a connection.
"I heard his voice, and I turned around, and it was like my life was over, or just starting. It hit me. It was love at first sight," Cuoco said. "We were immediately connected. I do feel like I've known him my whole life, but I wasn't ready for him."