ET spoke to the British actress on Wednesday about her new film, Sherlock Gnomes -- which hits theaters on Friday -- when she also talked about the upcoming Disney film. A clip of the movie that's been released features Blunt taking on Poppins' iconic umbrella flight, which the actress says was actually pretty scary to shoot!
When ET's Carly Steel asked Blunt what went through her mind the first time she got to fly, the mother of two cracked, "Whether I thought I was going to die. ... Fifty feet in the air, yeah."
"I'm not amazing with heights and it was one of those things where they kind of [get] you up there and there's the moment before they bring you down for the shot, and it seems like that moment extends for a forever time frame," she continued. "You're so high that if you look out you're higher than the trees and you look down. ... But it was an incredible moment, you know. Very disarming."
Blunt co-stars with Lin-Manuel Miranda in the film, who plays the Dick Van Dyke-esque character in the revival, lamplighter Jack. The actress gushed about working with the Pulitzer Prize-winning Hamilton creator.
"Awesome. So talented. So cool," she said of Miranda.
Mary Poppins Returns is not a remake of the 1964 film starring Julie Andrews, but will feature all-new musical numbers, a whole new cast of characters and even a different time period -- Depression Era London. ET spoke to Blunt last July at the D23 Expo Day, where she teased an epic dance routine.
“There's a huge dance number, which was slightly intimidating for me,” Blunt said. “I think I did all right. I mean, we did it 55,000 times, so I hope they got something.”