It’s splitsville for ‘Gossip Girl’ costars Blake Lively and Penn Badgley. The three-year relationship ended in mid-September, but a rep just confirmed the break up.

“They’re professionals,” a rep tells Us Weekly. “They’re still good friends and hang out on the set.”

Badgley, 24, told Us Weekly a year ago that he and Lively were comfortable working together while in a relationship.

“Some would say it’s a double-edged sword, but in our case, we manage to balance it well,” he said.

But in the end, a case of professional jealously may have bled over into their personal lives.

Lively, 23, has been on an upswing in her career.

She recently starred in the Ben Affleck movie “The Town” and stars with Ryan Reynolds in the upcoming “Green Lantern.”

In April, Badgley was reported to be appearing in a financial thriller drama, Margin Call, due for release next year. Other than that, “Gossip Girl” has been his biggest role.

The breakup didn’t seem to shake up the “Gossip Girl” set, according to Us Weekly’s insider. “Nobody on set had any idea. They’re really just private.”

They met as preteen actors in Los Angeles.

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