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Heroes co-stars Hayden Panettiere and Milo Ventimiglia have split due to “lifestyle conflicts” according to a source close to the couple.

Rumors that Hayden, 19, and Milo, 31, were dating, began in September, 2007, with the couple finally going public with their relationship in January, 2008.

Us magazine reports that the break up happened within the last week. “They were in very different places,” says an insider. “They are still on friendly terms. There are no hard feelings.”

The source claims Panettiere “likes to go out in the Hollywood scene,” while Ventimiglia “has been concentrating on work on his production company .”