Anne Hathaway has said she only learned she would have to speak in an English accent in her new film a week before shooting.
The Hollywood star said she was not confident in it and it "hasn't always gone well" for her before, but the director insisted it was vital to the role.
Hathaway uses an English accent in comedy film The Hustle, directed by Chris Addison, in which she stars alongside Rebel Wilson.
"I found out I had to do it a week before we started shooting," Hathaway told The Graham Norton Show.
"I thought if I didn't do it, it wouldn't make a difference, but the director insisted. I've done it before and it hasn't always gone well, and it's so stressful to see someone struggle through an accent, so I got a dialect coach and made the best of it."
Wilson, who is also the film's producer, appeared on the chat show alongside Hathaway.
"As the producer, I gave her all the accents and I was cast as Australian, so I did no prep!" she said.
The film sees Hathaway and Wilson team up in the female-led Dirty Rotten Scoundrels remake, in which they play two conwomen.
Wilson said: "They gave me $40m (€36m) and said, 'Go for it.'
"I asked Annie how much she wanted, I got some and we had really good catering.
"The film actually worked out well."
Hathaway also said that her son dislikes her singing so much, he puts his hand up to stop her.
However, the actress - who won an Oscar for her role in the musical film Les Miserables - said she became emotional when her son, Jonathan (3), allowed her to sing a song from Peppa Pig.
"He does not like my singing voice at all. When I sing he puts his hand up and says, 'Mama no! Mama no'," she said.
"He is a very tough crowd. Recently, though, I was singing something from Peppa Pig and he let me continue.
"I was crying and singing."
Hathaway and Wilson appeared on the show last night alongside Killing Eve star Jodie Comer, Harry Potter actor Daniel Radcliffe and singer-song- writer Mabel.