Though media outlets had reported they were living apart, and that Eastwood had been spotted with a mystery woman, Dina, 48, filed official documents this week.
She seeks spousal support and physical custody of their 16-year-old daughter, Morgan, though both parents would share legal custody.
The couple, married since 1996, do have a prenuptial agreement, and Dina's petition for support can be adjusted after separate and shared properties are determined.
Dina is a former TV anchor, and currently stars in the E! reality show "Mrs. Eastwood & Company," which premiered last May.
Clint, 83, was previously married to Maggie Johnson from 1953 to 1984. The legendary actor is currently directing the film adaptation of the Broadway hit "Jersey Boys."
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