Nina Dobrev is dating Derek Hough.

The 'Vampire Diaries' actress, who split from her co-star and boyfriend of three years Ian Somerhalder, 34, in May, has reportedly fallen head over heels for her best friend Julianne Hough's older brother.

A source told UsMagazine.com: ''[Nina] was hanging a lot with Derek's sister Julianne. Then she fell for him.''

Another insider added: ''Derek is smitten with Nina. He said he hasn't felt this way for a girl in a long time. ...Everyone approves!''

The 'Dancing With the Stars' star, 28, who has previously dated Cheryl Cole, Lauren Conrad and Shannon Elizabeth, received some kinds words from his new girlfriend after winning an Emmy award for Outstanding Choreography on Sunday (22.09.13).

She posted a picture of him with his trophy on her WhoSay account with the caption: ''Those of us touched by your light got to watch you brighten up the rest of the world. Keep shining!''

Nina and Julianne became close friends after she split from Ian and the 'Safe Haven' star broke-up with Ryan Seacrest earlier this year.

The 24-year-old actress initially insisted she wanted to stay single for a while but recently admitted she loves being in a relationship.

She said: ''You either have chemistry or you don't, but a lot of what attracts me is a guy's mind and humour and talent. I need to get to know all those things before I fall for someone. I'm not a one-night-stand kind of girl. I'm a relationship girl.''