Blake Lively is impressed with Jason Kelce‘s in-depth analysis of her film, The Sisterhood of the Traveling Pants.

“@jason.kelce being a natural investigative journalist sniffing out the hidden truth,” the actress, 37, wrote via her Instagram story on Friday, October 18, alongside a clip of Jason and brother Travis Kelce discussing the 2005 coming-of-age movie on the recent episode of their “New Heights” movie club podcast from Wondery+.

Lively starred in The Sisterhood of the Traveling Pants alongside Alexis Bledel, Amber Tamblyn and America Ferrera. The film, which is based on the book series of the same name, follows four friends who decide to stay connected by sharing a pair of pants — which magically fits their very different bodies — while they spend summer vacation apart.

In addition to applauding Jason’s thoughtful response to the movie, Lively also shared a fun tidbit about the book that author Ann Brashares told the actresses on set.

“Author @annbrashares shared with us when making the movie that she actually added the pants after the book was written because she was given the note to add a ‘magical element,’” she continued. “Mind you, this is when Harry Potter hit, so everyone was looking for magic in youth books.”

Lively explained that Brashares decided to use the pants as a “tangible item” to emphasize the “sometimes inexplicable magic of the female bond.”

“And there you have the Traveling Pants,” she penned. “Sisterhood of the Traveling Jeggings didn’t quite hit. Now it would be Sisterhood of the Printed Jean Pajama Bottoms. I’m here for it all.”

Tamblyn, 41, also responded to the Kelces’ thoughts via Instagram Story on Friday. “5 out of 5 footballs for this review, gentlemen,” she wrote. “Nice work. You’re both now honorary Sisterhood members. Xo, Tibby.”

On the Thursday, October 17, episode, Jason, 36, shared that he thought that The Sisterhood of the Traveling Pants was “not a bad film” overall. However, he was upset that the titular pants didn’t play a bigger role in the movie’s plot.

“I didn’t feel like they did a damn thing … and then [my wife] Kylie’s like, ‘You idiot, it’s a symbol that their friends are always with them,’” he said to Travis, 34. “And I was like, ‘Oh, OK. That makes sense.’”

Both Jason and Travis gushed over Lively’s performance in the film. The Kansas City Chiefs player joked that he “might have been a little biased” towards his girlfriend Taylor Swift‘s BFF. However, the siblings couldn’t help but tease Lively over some of her sporty scenes.

“A lot of the movie is just Bridget running,” Jason said. “I gotta admit, not the best run. Blake, I love you, it does not strike me as a star athlete run.”

Travis laughed and added that running while talking shows that the actress has “good endurance.”

“Running like that and to be talking? I would be f—ing gassed and would be way worse at trying to spit my lines out if I was running while talking,” Travis admitted.