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"It happened a little while ago," a source close to the couple tells me. "Stacy decided to end things."
Contrary to speculation that Keibler, 33, bailed because she wanted to get married and have kids, the source insists settling down with the 52-year-old Oscar winner was not a factor.
"Stacy has always said she doesn't know if she'll get married one day or have kids," the source said.