After months of insisting they were "just friends," Heroes stars Milo Ventimiglia and Hayden Panettiere are so on. Hayden turned 18 in August and is now legal. Milo is 30 and... well, dating an 18-year-old. In an interview with USA Today in December of 2006, a reporter asked Hayden what she thought about Milo. "He's…

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