Actor Dennis Quaid's third wife has filed for divorce, saying the couple's seven-year marriage has "become insupportable because of discord or conflict of personalities."

Kimberly Buffington Quaid filed a petition in Travis County, Texas, using the initials "B.K." and identifying Quaid as "W.D." William is Quaid's middle name, and two of the addresses in temporary orders issued as part of the case match up to those listed as among the Austin residences for Buffington Quaid.

There are also references to two children born in 2007, when the couple's twins, Zoe and Thomas, were born. The papers were filed March 2. Word of them was first reported Friday by TMZ.

Lisa Kasteler and Cara Tripicchio of WKT Public Relations issued a statement on behalf of Quaid saying, "we can confirm that Kimberley Quaid has filed for divorce."

"Contrary to what has been reported, a satisfactory settlement is being worked out for both parties," the statement said, adding that no more information would be provided "on this private matter."

Court documents show Buffington Quaid is seeking spousal support and attorney fees. They say she believes the couple will enter into a written agreement providing for "possession of, access to and support of" the twins.

According to a temporary order regarding the twins agreed upon by both parties on March 2, Buffington Quaid will be allowed to use a home in Austin and a Mercedes, while Quaid remains at another local residence with a Cadillac Escalade. The couple was to share a Range Rover already in Buffington Quaid's possession.

The twins were newborns when they nearly died in 2007. While at Cedars-Sinai Medical Center in Los Angeles, they were accidentally given an overdose of the blood thinner heparin. Quaid and his wife became the very public faces of the harrowing family ordeal.

"There were 41 hours where their lives were in the balance," Quaid told The Associated Press in 2010. He added that it was the most frightening day of his life and left him and his wife in "shock, anger and confusion."

Quaid produced and narrated a documentary about medical mistakes called "Chasing Zero: Winning the War on Heathcare Harm" for the Discovery Channel. Documents that became public afterward show Quaid and his wife agreed to a $500,000 settlement with the hospital.

Buffington-Quaid was a real estate agent in Austin when she met Quaid.

The 57-year-old Quaid is a Houston native. He married actress P.J. Soles in November 1978 and the couple divorced in 1983. He married another actress, Meg Ryan, in 1991, before they divorced in 2001.