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"We tried," Gunvalson, 48, told UsMagazine.com. "It's just too hard on both of us. It is amicable and we want to keep this as private as possible."
The reality star also opened up about the split on her official Facebook page.
"Donn has been an important part of my life and he will continue to be," she wrote. "I would like to thank all of you for the outpouring of love and support that we have received."
The couple's marriage troubles were heavily documented on past seasons of the Bravo reality show. But the twosome (who tied the knot in 1994) did seem to be making strides, as they renewed their vows during a televised ceremony in July 2009.
The couple has no kids together, though Vicki's children from her first marriage, Michael and Briana, lived with them in their home.