Miller, 31, is now engaged to and has a child with actor Tom Sturridge, 27.
She stars in the movie as a housewife who travels from Chicago to Sante Fe to participate in a bellydancing competition.
She travels with a North African woman, played by Golshifteh Farahani. They create a deep bond, despite their cultural differences, through their shared experience of unhappy marriages and a longing for something better.
Miller’s character, an American woman named Marilyn has just been devastated to learn her husband was having an affair. Shades of Schadenfreude!
Miller was the other woman in her affair with Balthazar Getty, a scion of the Getty oil fortune who was married with four children at the time.
She was photographed frolicking topless with him on the Amalfi Coast in Italy. The affair damaged her career, although Getty was able to salvage his marriage.
Miller, however, was on the receiving end when she discovered in 2005 that then fiancé, the actor Jude Law, cheated on her with the couple’s nanny. So she has a lot of inspiration to draw on.
The film will hit theaters this weekend. Check out the clip below, and follow TheImproper on Twitter for all the latest movie updates.