SPOILER ALERT: This story contains spoilers for the ending of “Our Little Secret,” now on Netflix.

Kristin Chenoweth had to channel her inner mean girl to play Lindsay Lohan’s judgmental mother-in-law in Netflix’s latest holiday rom-com “Our Little Secret.”

To create the sweet, “bless your heart”-esque Southern Mom, Chenoweth drew from comedians like Teri Garr and Carol Burnett (who she says is “like my second mother”), as well as people watching in malls and restaurants. She’s even taken a few cues from some of her own relatives — about which, she says tight-lipped, “I’d like to stay with the family, so I’ll be quiet.”

The film stars Lohan and “Pretty Little Liars” alum Ian Harding as exes who are forced to spend Christmas under the same roof after discovering their current partners are siblings. Harding says the film stands out among other holiday selections because of the unpredictable nature of the plot.

“Sometimes you see in the Christmas movies… it’s clear from the fifth minute that these people are coming together,” he says. “I like that, that at some points it seems like they’re healing old wounds or they’re coming together a little bit, but by the end they could potentially be friends.”

Fortunately, things work out for the estranged couple, who find their way back together at the end of the film. “It felt nice because it felt like for the characters, that’s what’s right,” Lohan says. They should be together! They just had to go on their own journey and find their own way to realize what was meant to be. They both had to grow up in different ways.”

Audiences are introduced to the less mature versions of Lohan and Harding’s characters in the opening of the film, which is set ten years in the past (when they were still a couple). To prepare for the scene, Harding and Lohan blasted their favorite hits from the early 2010s in the car – after Harding realized what that was actually like ten years ago.

“Maybe this is also what happens when, like me, you reach the stage of 30, where I think, ‘Oh, 10 years ago. So what music was that?’” Harding jokes. “And then I realized: I’m thinking about twenty years ago. I think I’m a lot younger than I am.”

The film was a blast from the past in more ways than one for Lohan, who is flanked by “Mean Girls” co-star Lacey Chabert and “Freaky Friday” love interest Chad Michael Murray in this year’s Netflix Christmas lineup ( Chabert leads “Hot Frosty,” while Murray stars in “The Merry Gentlemen”).

Lohan says she can’t wait for fans to see Murray in “Freakier Friday,” which hits theaters in August. “It’s exciting. Chad, like Jake, comes into the movie at full speed in ‘Freakier Friday’ on his motorcycle. It’s just a really fun movie. I have a feeling people are going to laugh a lot. In addition to a lot of passion, there are also other stories to tell. I’m really excited to share it with everyone.”

Lohan adds that she and Jamie Lee Curtis have had “so much fun” getting back on screen – but that’s not always a good thing, she says with a laugh. ‘We get into trouble when we work together. We just talk all the time. Constantly talking and yapping. There’s music in the car and she’s playing Chappell Roan. They say, ‘We’re trying to shoot here!’”