Real age of Sienna Miller in Stardust
In the movie Stardust, Sienna Miller was:
25 years old
That was the real age of the celebrity according to our calculation.
The calculation of the shown age took into account the first day of the year in which the movie Stardust was released:
January 1, 2007
And the day in which Sienna Miller was born:December 28, 1981
Since movies usually don't take more than one year to be released since the beginning of the filming process, Sienna Miller may have been one year younger or one year older than the shown age while some scenes of the movie were being filmed.