Hayden Panettiere and Milo Ventimiglia Split Over 'Lifestyle Conflict'

"Heroes" co-stars Hayden Panettiere and Milo Ventimiglia have broken up, US Weekly exclusively reported in a post on its site, dated February 16. Citing a source close to the couple, the news media claimed their separation happened within the last week and was prompted by "a lifestyle conflict."

According to the source, Hayden, 19, and Milo, 31, "were in very different places." She "is young. She likes to go out in the Hollywood scene and that's not his style," the source explained further, adding that the actor, on the other hand, "has been concentrating on work on his production company [Divide Pictures]."

Despite their separation, Hayden and Milo "are still on friendly terms. There are no hard feelings" between them, the source told US Weekly.

Hayden Panettiere and Milo Ventimiglia sparked dating rumors in late 2007. However, it wasn't until several months later that they went public with their romance. Days prior to their reported separation, rumors emerged that Hayden was seen cuddling with pop singer Jesse McCartney at Crown Bar. Hayden was said to be "all over" Jesse. She reportedly was caught holding the 21-year-old hunk tightly, sitting on his lap, and doing some crazy sexy dance on Jesse's lap.

No comment has been given just yet by either Hayden or Milo regarding report of their split. Hayden also has not yet commented on her alleged romance with Jesse.