Brad Pitt's daughter Shiloh has a cameo role in his latest movie.

Brad and Angelina's ten-month-old daughter plays Cate Blanchett as a baby in forthcoming film 'The Curious Case of Benjamin Button'.

A source told National Enquirer magazine: "Brad and Shiloh saved the day when twin sisters hired to take turns playing actress Cate Blanchett's character as a baby wouldn't settle down.

"Everyone waited in vain while the babies were fed, changed and hugged - but nothing worked to calm them on the set in New Orleans.

"Then quick-thinking Brad realised his daughter's happy and mellow disposition made her a quick fix for the role."

Shiloh, who had been playing in the on set day care centre, was swiftly put in costume.

The source added: "She's a natural. Shiloh did her scenes perfectly and was giggling and happy throughout her big day."

Brad and Angelina also have an adopted son Maddox, five, and an adopted two-year-old daughter Zahara.

Angelina is in the process of adopting a Vietnamese boy aged between three and four.