On Wednesday, the actress, 38, supported her man as he took on the role of Jamie in Love Actually Live at the Wallis Annenberg Center for Performing Arts in Beverly Hills.
Smith was overheard at the theater telling a friend that she’s loved Kazee as a fan for years.
Dewan, who began dating the Tony Award-winning actor at the beginning of October, wore a red, low-cut cropped top and wide-legged pants for the evening’s occasion.
When Kazee took the stage, a supportive Dewan was seen in the audience proudly smiling ear-to-ear and giggling. The Resident actress even cheered and clapped for Kazee when he took his jacket off on stage during one scene, in preparation to jump into a lake after his papers blew into the water.
When the show ended and the cast came out for their curtain call, the actress threw her hands in the air, clapping, cheering and catcalling her boyfriend.
Dewan and Kazee haven’t been shy about showing off their blossoming love.
Days after PEOPLE confirmed the two are dating, the pair were photographed kissing with their arms wrapped around each other in the middle of a sidewalk.
Making the moment even cuter, the duo wore coordinated looks. While Dewan opted for light blue jeans and a black top, Kazee wore a light denim shirt and black pants. Both rocked black shoes, with Dewan in heels and Kazee in loafers.
A source recently told PEOPLE that Dewan and the Broadway star have “been dating for a couple [of] months and she’s really happy.” The insider added the two have been spending quality time together and are getting closer.
“Jenna is having a lot of fun with Steve,” the insider said. “They’ve been dating for months out of the spotlight and it’s becoming more serious.”
“They have a lot in common,” the source added.
Most recently, the pair showed off their affection on social media. On Dec. 3, in honor of Dewan’s birthday, Kazee shared a series of photo booth images of himself and the actress playfully making faces, laughing and sharing a kiss.
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“Happy Birthday Jenna! Somehow it feels like my birthday over and over again because I keep getting the gift of you every day,” the actor wrote in the caption.
That same day, Kazee also dove into in her comments section to give her some love. The flirty comment was first caught by popular Instagram account Comments by Celebs. “Have you found your favorite yet??” Dewan wrote as her caption, with Kazee replying, “Yes. I have.”
Dewan and Tatum filed for divorce on the same day in separate filings in April 2018. They both asked for joint legal and physical custody of their daughter, Everly, and the actress has requested child and spousal support.