CLAIMS RYAN PHILLIPPE CHEATED ON REESE

Reese Witherspoon split from husband Ryan Phillippe because he allegedly cheated on her, it has been reported. A spokesman for the Oscar-winning actress announced the couple's mutually agreed separation on Monday, but it has now been claims that Ryan's affair with 24-year-old Australian actress Abbie Cornish (left) is the reason for the split. A source told Us Weekly magazine: "Ryan admitted it was true and said, 'We need to just end this.' Reese literally had no choice."Ryan, 32, met Abbie on the Texas set of their independent film 'Stop Loss' and it has been reported the couple were extremely open about their relationship during filming. The source said: "Ryan did not go out of his way to hide the fact that he was having a fling with his co-star Abbie Cornish. Besides the fact they were spotted making out in a sushi restaurant together, she was spotted many times leaving his loft apartment."Reese, 30, accompanied Ryan to the premiere of his new film 'Flags of Our Fathers' in New York two weeks ago where they were seen "fighting bitterly"at the after party. It has also been reported that Reese had found incriminating emails on her husband's BlackBerry handheld computer later that same night. A representative for Abbie has denied the allegations and representatives for both Reese and Ryan refused to comment. Reese has allegedly contacted celebrity divorce lawyer Robert Kaufman, who has represented Jennifer Aniston and Lisa Marie Presley, to aid her in hersplit. The 'Walk The Line' actress met Ryan at her 21st birthday party and they have two children together, seven-year-old daughter Ava and three-year-old son Deacon. The couple starred as lovers in cult teen movie 'Cruel Intentions'. Reese achieved box office success in the 'Legally Blonde' films before winning an Oscar this year for her performance in the Johnny Cash biopic 'Walk The Line'.

RYAN PHILLIPPE, REESE WITHERSPOON