The Vampire Diaries costars, who play Elena Gilbert and Damon Salvatore on the CW hit series, have called it quits after more than three years of dating.
The couple, who first took their romance public in 2011, are "consummate professionals," the insider says, and "will continue to work together and remain best friends, which is where the relationship started."
Last fall, Dobrev opened up to Seventeen magazine about falling for Somerhalder. "I didn't want to be dating one of my costars -- my goal on the show was to be professional," she admitted. "But sometimes you can't help who you have a connection with, and you can only fight it for so long -- which I did for a really, really long time."