Well, that was quick. Vampire Diaries actress Nina Dobrev and Dancing With the Stars pro Derek Hough have split after just six weeks of dating. Sources tell Us Weekly that "the distance was too much to handle" for Dobrev, 24, who films her show in Atlanta and Hough, 28, who works in L.A. Fortunately, Dobrev's friendship with Hough's sister Julianne is still intact and there are reportedly "no hard feelings." So what happened? Perhaps Dobrev realized she'd downgraded from Vampire Diaries costar Ian Somerhalder, whom she dated for three years before calling it quits in May.