The 24-year-old actress and the 28-year-old actor, who starred together on two seasons of the hit series American Horror Story, started dating back in 2012 and got engaged this past Christmas.
“Their three years together just ran its course,” our source tells JJ. “They have so many great memories together but couldn’t make it work in the end. The break-up was amicable – there was no drama whatsoever. Emma and Evan are even still friends!” Reps for both actors couldn’t be reached for comment.
Emma next stars in Ryan Murphy‘s new Fox series, Scream Queens, premiering September 2015. Evan is currently shooting X-Men: Apocalypse as Quicksilver.
Pictured inside: Emma stepping out for a night out at The Nice Guy sans her engagement ring on Thursday (June 11) in West Hollywood, Calif.