Josh Hartnett took two of his daughters to a London stop of the Eras Tour earlier this summer.
Josh Hartnett is recalling his epic night at Taylor Swift's Eras Tour.
ET spoke to the 46-year-old actor at the premiere of his new film, Trap, on Wednesday, and he detailed his experience at Swift's London concert with two of his daughters. Hartnett shares four kids -- whose names and ages have never been publicly revealed -- with his wife of three years, Tamsin Egerton.
"I went to one about three or four weeks ago with my kids. It was great," Hartnett gushed after attending the concert.
Harnett previously spoke about his Eras Tour experience earlier this month, telling The Hollywood Reporter that it was a "good event for my daughters' first concert."
"I went to the Eras Tour with my daughters recently, and it was wild," he told the outlet. "I've never experienced anything like it: 90,000 people at Wembley Stadium losing their minds, including my two daughters. And people were so respectful, my daughters were given so many bracelets, and everything was really sweet."
Hartnett's new movie, which was directed by M. Night Shyamalan, follows a man and his teenage daughter who realize they're at the center of a dark and sinister event while watching a concert.
"I'd never been to [an Eras Tour show] before we shot the film, so I thought that what M. Night was directing the kids to do was a little over the top," Hartnett told ET. "It's not. No, kids lose their mind -- absolutely lost their minds."
As for what fans can expect from the psychological thriller, Hartnett teased, "M. Night has done such a great job of taking genres that we think we understand and twisting them on their side and coming at them at a new angle."
"This is a thriller, like a sort of throwback style '90s thriller that is looked at from the point of view of the antagonist," he said. "... It was definitely a lot of fun to play this character. I wouldn't want to play him every day. It's more fun to always switch roles and try different things all the time. I'm always trying to subvert people's expectations with the work that I'm doing. Hopefully, this will surprise you."
Trap will hit theaters Aug. 2.
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