Although Brad Pitt and Angelina Jolie wouldn't have a hope of winning a lawsuit in the US for this kind of article, they are suing News Of The World for the infamous split story of a few weeks ago.
Their London based attorney told Sky News, "The News of the World has failed to meet our clients' reasonable demands for a retraction of and apology for these false and intrusive allegations which have now been widely republished by mainstream news outlets. We have advised them to bring proceedings which they have now done."
I love how he takes a little dig and calls News Of The World a non mainstream news outlet. Chances are they sell more papers than most main stream news outlets. Since you almost always win these cases in the UK, Brad and Angelina will get a nice apology and a token sum of money and business will continue as usual. At least they are making some kind of effort.