Hayden Panetierre and Milo Ventimiglia are splitting up, US Weekly is reporting. 

The Heroes co-stars began dating in 2008 but kept their relationship on the dl, mostly due in part to their 12-year age gap.

"It was a lifestyle conflict," a source close to the couple tells the mag, adding that the split happened within the last week. "They were in very different places."

The source adds that, "She is young. She likes to go out in the Hollywood scene and that’s not his style."

Bummer! Oh well, a new year means it’s time for new romance!