Emma Roberts, Evan Peters Call Off 6-Month Engagement

Emma Roberts and Evan Peters have split, multiple outlets report.

"Their three years together just ran its course," a source told Just Jared about the American Horror Story costars, adding that the break-up was amicable. "They have so many great memories together but couldn't make it work in the end."

The pair started dating in 2012, made it through a very public relationship squabble, and got engaged during the holidays in 2013.

"The grew apart," seconds a People source. "They both had a lot of growing to do and it was better that they do it on their own."

Roberts, 24, and Peters, 28, first met while filming indie flick Adult World, but it wasn't until she was cast on the Ryan Murphy anthology series (they played on-screen love interests for two seasons, Coven and Freak Show) that their off-screen chemistry blossomed.

"I actually, on the [Adult World] set, was like, 'Oh yeah, we're totally gonna date,'" Roberts revealed last year. "And I would try to like flirt with him, which ended up looking like I had something in my eye because I'd be like, 'Hey, what's up?' And he literally didn't speak to me the entire movie. He thought I was so weird." He reached out to her once filming wrapped, she said, and the rest was history—until now.

Reps for the actors have yet to comment, but Roberts—who will star on Murphy's new Fox series, Scream Queens—was most recently spotted without her engagement ring in Los Angeles on June 11. Peters will return for the fifth season of Horror Story, which is titled Hotel, and is currently shooting X-Men: Apocalypse.