United Kingdom, Aug. 12 -- Dakota and Elle Fanning were "silently panicked" by the thought of working together on The Nightingale.

The siblings star together in the new historical drama film, and Dakota has admitted to feeling anxious prior to shooting the movie adaptation of Kristin Hannah's war novel.

During an appearance on The Tonight Show Starring Jimmy Fallon, Dakota shared: "We were quietly nervous about it. I think we didn't really want to tell the other one how nervous we were."

Dakota, 32, was initially unsure how they'd chime on a movie set.

She said: "We were like, 'Are we gonna laugh? Like, are we gonna be able to keep it together?'

"It's the person that knows you best in the world that you're acting with, and we're supe...