Dennis and Kimberly Quaid separate for second time American actor Dennis Quaid and British actress Sienna Miller attend a photocall for "G.I. Joe: The Rise Of Cobra" at HMS Belfast, South Bank in London on July 22, 2009. LOS ANGELES, Oct. 19 (UPI) -- Dennis Quaid's publicist said Friday the "Vegas" star's wife Kimberly has filed for legal separation after eight years of marriage. The former couple are the parents of 4-year-old twins, a son and daughter. Kimberly and Dennis Quaid have decided to legally separate after eight years of marriage. They ask that their privacy and the privacy of their family be respected during this difficult time," Quaid's representative told People.com. Kimberly Quaid, a former real estate agent, filed for divorce in March, but reconciled with her husband the following month.