Liberty Ross has reportedly hired a lawyer to order to obtain a quickie divorce from husband Rupert Sanders.
The director recently admitted that he was unfaithful with actress Kristen Stewart.
Ross is thought to want to return to the UK with the couple's two children Skyla and Tennyson.
A source told The People: "She only moved to the States to support Rupert and his career.
"She has no strong ties in the US nor does she want to remain here.
"She has made it clear that she wants to move back to the UK with her children."
They added: "She obviously wants them to carry on seeing their father, but she feels there is no point in staying in the US.
"Given that the majority of her family and friends are in the UK, nothing is holding her here and the kids are young enough to start a new school and not be affected."
Liberty is thought to have started divorce proceedings the same week she found out about the affair.
The source added: "Liberty plans to mediate this out of court in a swift and efficient way, for the sake of her children.
"She just wants a clean break. She and Rupert have met with a mediator and are working things out in a civil manner. She's suffered enough."
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