DENNIS QUAID’S WIFE FILES FOR SEPARATION

Dennis Quaid's wife, Kimberly Buffington-Quaid, has filed for legal separation but sources tell us it's only a formality and the legal docs will be changed to a full-on divorce in several months.  Kimberly is asking for joint legal and sole physical custody of the couple's 4-year-old twins.  She's down with Dennis getting visitation.