Gwyneth's Marriage On The Rocks?

First Heath and Michelle, now Gwyneth and Chris Martin? OK! Magazine is reporting that the couple - who wed in December '03 and now have two children - may be headed for a break-up. Aside from the fact that the two are never seen in public together and spend months apart in different locations, witnesses say that Gwyneth rarely mentions her husband, and when she does she sounds "vague and unenthusiastic." Instead, the actress tends to "change the topic to her kids, Apple and Moses." Trouble in the air or just keeping her public and private life separate?