Hayden & Milo Get Hot and Heavy on 'Heroes' Set

Hayden Panettiere and costar Milo Ventimiglia get a little frisky with each other in between takes on the set of Heroes in Los Angeles on Saturday.

The loved-up couple playfully cuddled up behind a trailer, whispering in each other’s ears. Why was Milo gently pushing Hayden up against the trailer?? Hmm??

Hayden, 18, and Milo, 30, were later seen grabbing lunch together from the catering tent before returning to their trailers. The couple has been dating since late last year. Milo (Peter) plays the uncle of Hayden (Claire) on Heroes.

30+ pictures inside of Hayden and Milo getting hot and heavy on the set of Heroes…