Emma Stone rehearsed for "months" to get her dance steps spot on for 'La La Land'.
The 27-year-old actress underwent gruelling sessions to get her moves right for the musical film, but admitted if she or co-star Ryan Gosling made mistakes they were able to stay in the motion picture because they were playing "real" people.
She said: "We rehearsed for months. Mandy Moore, the choreographer, took us through all the moves; and I had much to learn, even though I did song and dance as a kid in Arizona.
"Mia and Sebastian are two very real people, so the great thing about Damien [Chazelle, director] was that if we missed a step, or a beat, it wasn't cut. I'm not Idina Menzel."
Stone portrays aspiring actress Mia in the movie, opposite Gosling's alter-ego, jazz pianist Sebastian, who fall for each other in Los Angeles.
The 'Amazing Spider-Man' star took inspiration from her character's idol, late actress Ingrid Bergman.
Speaking about the Swedish star, she told the Daily Mail newspaper: "She was so focused and so professional in spite of everything that was going on in her private life.
"She was given a hard time by a Hollywood that wanted her to be a saint."
While the movie is likely to pick up many a fan along the way, one big supporter of the film is Hollywood legend Tom Hanks.
After watching a screening of the motion picture at the Telluride Film Festival, he declared: "Man, that was the most fun I've had in a thousand years!"
This comes after he interrupted a press conference for his own movie 'Sully' to say he thinks Hollywood is "doomed" if people don't like 'La La Land'.
He said: "This is not a movie that falls into some sort of trend. I think it is going to be a test of the broader national audience, because it has none of the things that major studios want.
"Pre-awareness is a big thing they want, which is why a lot of remakes are going on. ['La La Land'] is not a sequel, nobody knows who the characters are ... But if the audience doesn't go and embrace something as wonderful as this then we are all doomed."
Tagged in Ryan Gosling Emma Stone Idina Menzel