18. Abbie Cornish
Cheater: Ryan Phillippe
Date Of Affair: August 2006 - February 2010
Pretty Abbie Cornish has got a name that sounds straight out of a Harry Potter book. But her romance with actor Ryan Phillippe had no fairy tale ending or beginning for that matter. The Australian actress, she of the elegant features, allegedly became bedazzled with Mr. Reese Witherspoon during the making of Stop-Loss which was shot all around Texas.
In case you didn't know, Reese has a lot of admiring followers and, boy, was they mad at Ryan for crossing the fidelity line on the Legally Blonde after seven years of marriage. As fate would have it, Cornish and Phillippe called it Splitsville shortly after the enticing lass finished shooting Sucker Punch; the time to hit it and quit had apparently arrived.