After 25 years of wedded bliss (or perhaps not), California's star power couple Arnold Schwarzenegger and Maria Shriver are going their separate ways.

The split was announced in a statement issued last night by the former Governor and his First Lady. Together, they have four children, whom they will continue to raise jointly. TMZ hints that Shriver, the niece of the late President John F. Kennedy, has been discontent for years in the relationship, and that the split has been "a long time coming."

Schwarzenegger has been in the midst of transitioning back into the world of Hollywood and is currently attached to three films: Terminator 5 (to be directed by Fast Five's Justin Lin), Cry Macho, and The Governatorwhich will be released in 3D.

Since Arnie left office, though, he and Shriver have seemingly been living separate lives. While the former Mr. Olympia has been implementing his show business comeback, Shriver, a former contributing anchor on NBC's Dateline, has worked on her women's empowerment website, guest edited an issue of Oprah Winfrey's magazine O, and promoted Alzheimer's research, a cause that's near to her heart.

The 63-year-old Arnold and 55-year-old Maria met in 1977 when Tom Brokaw introduced them at a charity event. They were married in 1986.

[Via ABC News]