Nina Dobrev, Ian Somerhalder Nina Dobrev, Ian Somerhalder

It seems like Vampire Diaries power couple Nina Dobrev and Ian Somerhalder aren't only having relationship drama on-screen this season. The real-life couple, who have been publicly linked since 2010, have split, according to Us Weekly.

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Dobrev and Somerhalder are "consummate professionals" who "will continue to work together and remain best friends, which is where the relationship started," a source tells Us.

Somerhalder may have alluded to the breakup on Twitter Thursday morning, where he posted, "A THOUGHT FOR TODAY: People change and forget to tell each other. -Lillian Hellman, playwright (1905-1984)."

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A rep for Dobrev tells "We don't comment on our clients' personal lives."

The Vampire Diaries airs Thursdays at 8/7c on The CW.