The 38-year-old former child star is reuniting with her screen mom Jamie Lee Curtis, 65, for a long-awaited sequel to the 2003 body-swap classic as Anna and Tess Coleman, respectively, and she has been feeling very nostalgic about her Disney years and "emotional" reuniting with her co-stars.
She said of recently returning to the Walt Disney Studios in Burbank, California, on 'Nightline': "Jamie [Lee Curtis] and I have stayed in touch over the years".
"You know how they say when you have a best friend or someone you're really close with? If you cannot see them for years and years, but when you see them again, it's like you never separated".
Lindsay continued: "I think really for me was when I went onto the Disney lot. And being back on the Disney lot because that's not just Freaky Friday for me. That's The Parent Trap, that's Confessions of a Teenage Drama Queen, that's Herbie. It's so many moments for me. So when I got there, I kind of felt like this essence of a little kid again".
She gushed: "I'm so grateful for every moment of it. Every second... I'm going to, like, get emotional. It's a great experience".
Production was underway a week ago, with the pair posing for a picture outside their trailers.
The script comes from Jordan Weiss and is directed by Nisha Ganatra.
In the second movie, Lindsay's alter ego Anna will be all grown up with a child of her own and a new stepdaughter to contend with.
The cast also includes new additions Julia Butters, Sophia Hammons, Maitreyi Ramakrishnan and Manny Jacinto.
Mark Harmon, Chad Michael Murray, Christina Vidal Mitchell, Haley Hudson, Lucille Soong, Stephen Tobolowsky and Rosalind Chao will return.