The couple, who attended Saturday's GLAAD Media Awards in Los Angeles, told PEOPLE that they enjoy low-key time together, preparing gluten-free meals and hunkering down for a TV show or a movie.
"He cooks me dinner, we drink some tea and watch some great TV shows or a movie," Willis, 24, said of Blair, 28, who plays Clay Clemmons on NBC's The New Normal.
Cooking-in suits the couple, dating since August, because they share the same digestive affliction, Blair said.
"I love to cook. She does as well, but I like to cook for her. So we cook, usually something very healthy because we both cannot have gluten, unfortunately," he said. "So I guess we were made for each other, since we have to suffer together through our food choices."
Willis made her way on the red carpet newly blonde, saying she was loving the change and had been inspired by old Hollywood glamour.
"I'm a huge fan of Veronica Lake," she said, referring to the blonde bombshell of the 1940s, who was known for the lock of hair covering one of her eyes, "and I figured, when I’m young, I might as well try it out before I have to be more conservative."