Dan Levy plays a smaller role in Happiest Season, but the Schitt's Creek star and co-creator made a lasting impression on the entire cast, including his queer co-star Kristen Stewart.

Speaking to NewNowNext in February from the set of Clea DuVall's holiday-themed queer rom-com, Stewart openly gushed about how much she enjoyed working alongside Levy. "I am so in love with Dan," she said. "It's insane."

Stewart stars in Happiest Season as Abby, a queer woman whose plan to propose to her girlfriend, Harper (Mackenzie Davis), goes awry when she realizes her GF isn't out to her family. Levy plays John, Abby's longtime BFF. To Stewart, it was important for whoever played Abby's best friend to be "a really grounded reflection of who she is." Viewers don't get to spend a lot of time with Abby in her natural element, so her interactions with John ensure she reads as fully fleshed-out.

"I think that [Dan] is so perfect because when he really brings it home and he wants to connect, he comes from a place of true understanding of what the story is and how heavy and hard it is," she added. "It can then be funny, but first it needs to be completely understood from the inside."

It helps that Levy is "so unbelievably funny" as John, too. "Dan's fucking amazing," Stewart said. "The entire cast is so great. We've said a million times to each other every single day."

Stewart (L) and Levy (R) in Happiest Season.

Fellow Happiest Season cast members Mary Steenburgen and Victor Garber (Harper's mother and father, respectively) are in agreement. Meeting Levy was especially exciting for Steenburgen, who loves Schitt's Creek.

"With Dan, it's like, if he had been anything less than wonderful, I would have been devastated because I'm such a fan of that show," she told NewNowNext. "I asked him, 'So the sweaters [in Schitt's Creek], like, where did those sweaters come from?' And he goes, 'They're women's sweaters from consignment stores.' They're women's. And he finds them and dresses everybody in the show. And it was like—oh, I literally, I couldn't take it. I was so enchanted."

Garber, who is also gay, is an old friend of Eugene Levy, Dan's father and Schitt's Creek co-star. He and Eugene appeared together in a Toronto production of the musical Godspell in the 1970s. "I adore [Dan]. And I have to be really nice to him," he joked, "because he'll hopefully hire me."

Happiest Season premieres November 25 on Hulu.