'Vampire Diaries" star Nina Dobrev and Emmy Award-winning "Dancing With the Stars" choreographer and dancer Derek Hough have begun dating, Us Weekly reports. Dobrev, 24, dated fellow "Vampire Diaries" star Ian Somerhalder for three years before breaking up in May. Hough, 28, is the older brother of dancer-actress Julianne Hough, one of Dobrev's close friends. On Monday, Dobrev posted a WhoSay photo of an Emmy-clutching Hough, captioned, "Those of us touched by your light got to watch you brighten up the rest of the world. Keep shining!"