Sorry, fellas: It looks like Canadian cutie Nina Dobrev is taken.
The pair were set up by Julianne herself and have been dating since August.
“It got serious really fast and they're inseparable," said a source. “They're already saying ‘I love you.’”
Nina and Derek seem keen on sharing their newfound romance with the world. After winning the Emmy for Outstanding Choreography on Sunday night, Nina gushed to her beau via Twitter, saying, "#EMMYWINNER I cant express in 140 characters how unbelievably excited+incredibly proud I am of you. You deserve this :)"
Derek responded: “Your [sic] the best babe.”
Nina, 24, split with her boyfriend and co-star Ian Somerhalder in May. Derek, 28, has been previously linked to Cheryl Cole, Shannon Elizabeth, and Lauren Conrad.