Hayden -- Milo Is Totally Hittin' That

Hayden Panettiere,18, and Milo Ventimiglia, 30, have been doing their heroic best to deny any co-star lovin' between them. But it looks like their cover is blown, finally, according to these snaps.

The twosome was spotted at the movies taking in "Atonement" in Los Angeles. One adult and one child!

According to sources, the dynamic duo were kissin' in the theater. Save the relationship!