Hayden & Milo Sittin' in a Tree?

9/17/2007 2:38 AM PDT
No, they weren't K-I-S-S-I-N-G, but "Heroes" co-stars Hayden Panettiere and Milo Ventimiglia were looking pret-ty cozy last night after the Emmy Awards.

TMZ cameras caught the twosome walking arm-in-arm outside of HBO's after-party. When our cameraman approached the duo and asked if they were dating, Hayden got defensive, sassily saying, "I'm holding onto him because I'm about to fall over in these heels!"

The photog smoothed things over with Hayden by telling her she looked "gorgeous" -- Panettiere flashing a smile before taking off with her man co-star.