That trip to Europe publicizing Heroes changed everything for Hayden Panettiere and her costar Milo Ventimiglia. It must have been MIGHTY romantic and we just learned the details about what happened when they came back. (Check out that body language, above.) Hayden and her boyfriend Stephen Colletti (One Tree Hill) went to Les Deux to celebrate her return and things went immediately bad. He must have been suspicious about Milo because he started SCREAMING at Hayden in the club. A witness said the veins in his neck were sticking out. After he finished his tirade he stormed out (for GOOD), but Hayden remained calm. Minutes later Milo strolled in and sat down with Hayden. They partied as if nothing happened and left holding hands. Milo and Hayden are making a feeble attempt to keep the romance under wraps, but we all saw them sitting side by side at the Emmys, didn't we?
