Julianne Moore's children's books are being turned into a musical.

The 'Far From Heaven' actress has promised that the production of 'Freckleface Strawberry' - which will open in New York off-Broadway on October 4 - will have appeal to people of all ages and will stay true to her original story of a seven-year-old girl trying to come to terms with her red hair and freckles.

She told the New York Times newspaper: "It's really exciting and fun, and kind of amazing and given my history as a performer, super-weird to be in this other position.

"Everybody should enjoy it, but remember that Freckleface Strawberry is 7 years old. That's the character, so I wanted to make sure that in the jokes and the humour, we stay within that, because that's the charm."

The 46-year-old star - who has two children, nine-year-old Cal, and five-year-old Liz with director husband Bert Freundlich - wrote the books based on a nickname she was given age seven.

She said "Of course, you grow up and you go, 'What's so bad about that?' The message in the book is that the little girl grows up and her freckles don't go away. I didn't want it to be a fairytale. We all have things about ourselves that aren't our favorites, but in the grand scheme of things, it's the last thing that's important."

The musical will be directed by Buddy Crutchfield and choreographed by Gail Pennington Crutchfield.

The cast has not yet been announced, but will reportedly feature adults in the children's roles.

Previews will begin on September 9.