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.