Maria Shriver stood by Arnold Schwarzenegger when he ran for California's governorship in 2003, even after several women accused him of lecherous behavior.
On Friday, 25 years after their fairytale wedding on Cape Cod, she filed for divorce.
The former television journalist and Kennedy family heiress cited irreconcilable differences but offered no additional details about the breakup.
Shriver did not list a date when the couple separated, although they announced they had done so on May 9.