Milo Ventimiglia

Hayden Panettiere and Milo Ventimiglia have called off their relationship, according to reports. "It was a lifestyle conflict," a source close to the couple tells Us Weekly, adding that the split happened within the last week. The source tells Us that Hayden Panettiere, 19, "is young. She likes to go out in the Hollywood scene and that's not his style."

"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." 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.