Reese Witherspoon and Ryan Phillippe are going separate ways, according to reports. "We are saddened to announce that Reese and Ryan have decided to formally separate," publicist Nanci Ryder said in a statement issued today on behalf of the couple. "They remain committed to their family and we ask that you please respect their privacy and the safety of their children at this time," the brief statement concluded.Ryder told the Associated Press she could not add anything further on the split.However, celebrity website, which broke the story, reported that Witherspoon had contacted the divorce lawyer who represented Jennifer Aniston and Lisa Marie Presley.TMZ quoted one unidentified source as saying the breakup was not triggered by any single event but rather by "cumulative" circumstances.Witherspoon, 30, and Phillippe, 32, have two children, Ava, 7, and Deacon, 3.The pair, who co-starred in the 1999 movie Cruel Intentions, wed that same year.Witherspoon established herself as a major box-office draw as star of the 2001 comedy Legally Blonde and scored a follow-up hit with Sweet Home Alabama.In March, Witherspoon took out the Best Actress Academy Award for her role as June Carter Cash in 2005's Walk the Line. Phillippe co-starred in the Best Picture winner, Crash, and is starring in Clint Eastwood's latest film, the World War II drama Flags of Our Fathers.