'Grey's Anatomy' star Sandra OhSandra Oh, who plays the relationship-impaired Christina Yang on "Grey's Anatomy," is now officially single again.

The 35-year-old Golden Globe winner and "Sideways" director Alexander Payne's divorce decree went through on Dec. 21.

According to the documents found on TMZ.com, the marital dissolution status was granted in the best interests of both parties, who wanted to file their taxes separately.

Other financial matters, however, must still be resolved, including their retirement/pension plans for the Screen Actors Guild, Writers Guild of America, Directors Guild of America, American Federation of Television and Radio Artists, Pretty Intelligent Girl Productions, Inc. Profit Sharing and Lopez Roofing.

The couple announced that they "mutually decided to separate" in March 2005 and Oh filed for divorce the following month. Payne, 45, and Oh, 35, met six years ago and have been married since 2003.

"Sideways" stars Paul Giamatti as Miles, a frustrated writer who travels through California wine country with his has-been actor pal Jack. Oh plays Stephanie, Jack's intended "last fling" before he gets married.

Payne, who recently won the Oscar for best adapted screenplay with Jim Taylor for "Sideways," is also the writer-director of "Citizen Ruth," "Election" and "About Schmidt."

Oh's film credits include "The Red Violin," "Waking the Dead," "The Princess Diaries" and "Under the Tuscan Sun." A regular on HBO's now-defunct series "Arli$$," she currently stars in the ABC medical drama "Grey's Anatomy."