The 34-year-old Two And A Half Men star who is currently the highest paid actor on TV and earns $700 000 per episode is said to be refusing to budge on the financial terms of their separation and how they should divide their assets.
A source told US Weekly magazine the actor is "so cheap" and is refusing to sign off on the paperwork so they can finally go their separate ways.
Ashton has already moved on from the actress and is reportedly living with his new girlfriend Mila Kunis, whom he has known for 14 years as they previously starred in the hit comedy series That 70s Show together.
Rumours circulated that they weren't married
Rumours circulated last week that the estranged spouses may not have ever been legally married as they have yet to file for divorce despite separating last year after six years of marriage, but their marriage certificate has since been uncovered.
InTouch magazine has also published a signed quitclaim deed a legal instrument by which the owner of a piece of real property, called the grantor, transfers his or her interest to a recipient, called the grantee. This shows that 49-year-old Demi signed over her share of their former Los Angeles home to Ashton last March.
But the former couple, who separated last November following Ashton's affair with 22-year-old Lisa Leal, are said to be disagreeing about how to divide up their remaining assets.
According to reports, Demi is worth $150m, while Ashton's fortune is said to be worth $139m.
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