According to TMZ.com, the "Cruel Intentions" stars haven't filed divorce papers, but the Oscar-winning actress has enlisted divorce-lawyer-to-the-stars Robert Kaufman, famous for extricating Jennifer Aniston, Roseanne and Lisa Marie Presley from their wedding vows.
The 30-year-old Witherspoon and her 32-year-old husband met at her 21st birthday party. They have two children, Ava and Deacon.
Witherspoon and Phillippe's reps presented TMZ with the following statement: "We are saddened to announce that Reese & Ryan have decided to formally separate. They remain committed to their family and we ask that you please respect their privacy and the safety of their children at this time."
An unnamed source tells the celebrity site that the cause for the split was "cumulative." Expect plenty of additional details in the days to come.