That was fast.

After just six weeks of dating, Nina Dobrev and Derek Hough have decided to break up, sources tell E! News. The Vampire Diaries actress and the Dancing With the Stars pro were first linked in late September after being introduced through Julianne Hough, Dobrev's BFF and Derek's younger sister.

"It was nothing serious," an insider explains. "They were just having fun." Derek's rep declined to discuss the Emmy winner's personal life, and Dobrev's rep did not respond for comment. The insider adds that their breakup was a mutual decision: "There was no drama."

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