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 center, 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.