Mark Rylance is unsure about the identity of the One Direction singer starring in his next film, Dunkirk.
Pop star Harry Styles will make his acting debut in the movie about the Second World War evacuation, but Mark has him mixed up with the film's other young star, Fionn Whitehead.
Asked about Fionn in an interview with the Radio Times, he said: "Do you mean the young boy who's in a boy band?"
Dunkirk will be a change of direction after Steven Spielberg's adaptation of Roald Dahl's The BFG, in which Mark, 56, stars as the Big Friendly Giant.
The BFG is Steven and Mark's second collaboration, after they worked together on 2015´s Bridge Of Spies.
However, the actor revealed during Desert Island Discs last year that he had previously turned down a chance to work with the director 30 years ago, rejecting a part in Empire Of The Sun.
Three decades later, Bridge Of Spies, which won Mark an Oscar, led to a firm friendship between the two.
On working together for the first time, the actor said: "It was like meeting an old friend."
Steven said: "Yes, that's how I felt, too. I felt like we had been working together all my life. It felt like I'd known him all my life."
He added: "We became pals, which I don't often do. You know, we're all gypsies and we move into other worlds, but I didn't want Mark to leave my world at all."
Mark is not the only actor to say no to the director. Others include Steve McQueen, Gene Hackman and Daniel Day-Lewis, who starred in 2012´s Lincoln.
The filmmaker explained: "I'm very proud of the fact that I've been turned down by some of the greatest actors in history.
"Daniel Day-Lewis turned me down three times before I finally prevailed upon him to play Abraham Lincoln."
Read the full interview in the Radio Times, on sale now.