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Arpad Busson, Uma Thurman

Kevin Mazur/WireImage.com

Uma Thurman's fiancé won't be putting a ring on it anytime soon.

A year and a half after getting engaged to Swiss financier Arpad "Arki" Busson, and eight months after the duo was rumored to have quietly walked down the aisle, Thurman and her beau have officially uncoupled.

So far, there's no official word on the split from the star's reps, but sources close to the actress have been letting it slip that the duo called it quits nearly two months ago. They're said to still be friends (of course they are).

Those closely following the relationship between the New York-based, 39-year-old mother of two (from Ethan Hawke) and the London-based, 46-year-old father-of two (from Elle Macpherson) may not be too surprised.

Just this fall, Thurman said marriage wasn't exactly a top priority.

"I'm happily engaged but we haven't set a wedding up," she told W. "I'm not in a rush to do anything. One day we'll do it, when we're ready. We can't live anywhere else because my children's father lives here. We'll figure it out."

Guess this is the result of their figuring.

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Check out which other star couples weren't built to last in our Big Celebrity Splits gallery.