It looks as if Ryan Phillippe has been allegedly having an affair with 24 year old Australian actress Abbie Cornish. She was his co-star on the independent film “Stop Loss”. Rumors are that they did not even try to hide their heated affair on the set. A source told Us Weekly magazine: “Ryan admitted it was true and said, ‘We need to just end this.’ Reese literally had no choice.” 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.”

Abbie’s rep of course has denied allegations and reps for Reese and Ryan are tight lipped as well.

Tags: Reese Witherspoon, Ryan Phillippe