Does this mean the official end of Dan and Serena?

After three years together as an off-sceen couple, actors Blake Lively and Penn Badgley have called it quits. A rep for the Gossip Girl costars confirmed the split.

Despite the breakup, the pair have vowed to stay friends. "They're professionals. They're still good friends and hang out on the set," a source told Us Weekly.

News of their separation is said to have shocked their coworkers. "They kept this news to themselves for a while. "Nobody on set had any idea. They're really just private," the insider said.

According to Star magazine, it was Badgley who ended things. "Blake comes from a traditional Southern Baptist background, and she's always had her eye on getting married and having lots of children," a friend told the tabloid.

"The pressure on [Penn] to settle down at such a young age finally reached the point where he realized he and Blake couldn't get on the same page, timing-wise, about starting a family."