Gossip Girl stars Penn Badgley and Blake Lively have ended their three-year romance, a rep for the twosome exclusively tells the new issue of Us. OMFG!

They called it quits in mid-September, amicably. "They’re professionals," an insider says of the pair. "They're still good friends and hang out on the set."

The duo, who met as preteen actors in L.A., then began dating as their characters were dating on Gossip Girl, "kept this news to themselves for a while."

Blake Lively and Penn Badgley have broken up after almost three years.

Indeed, they have always taken a drama-free approach to their relationship, and that includes the breakup aspect of it. They just go about their business.

Even those closest to the twosome may be shocked to hear the news. "Nobody on set had any idea," says the insider. "They're really just private."

We're sorry to hear about this breakup news, although it does put a new spin on Blake's rumored hookup with Ryan Gosling earlier this month.