Hayden Panettiere and Milo VentimigliaHayden Panettiere and Milo VentimigliaHayden Panettiere and Milo Ventimiglia are no more.

Although their relationship seems a bit of an urban myth anyway.

The Heroes stars reportedly began dating in December 2007 and sources say that they bit the dust last week.

Us magazine's source reckons: "It was a lifestyle conflict. They were in very different places.

"They are still on friendly terms. There are no hard feelings."

Us mag's mystery source reckons 19-year-old Hayden didn't have enough miles on the clock for 31-year-old Milo:

"(She) is young. She likes to go out in the Hollywood scene and that's not his style."

As neither star ever confirmed the union, we can't say we'll miss these lovebirds on the celeb scene.