Uh-oh, it seems like Nina Dobrev is not ok with her ex-boyfriend Ian Somerhalder dating Nikki Reed. According to Celebrity Dirty Laundry, there's a lot of drama brewing on set of "The Vampire Diaries" and Dobrev is threating to quit the show. Somerhalder and Dobrev, who split last year, both costar on the CW show.  

A source told the gossip site that Somerhalder and Dobrev don't speak when they see each other on set. Reportedly, Dobrev doesn't like Somerhalder bringing his new girlfriend to the set. Somerhalder and Reed have only been dating a few months but, reportedly, things are already serious between them.

According to US Weekly, the two are living together and the "Twilight" actress spends as much time as possible on set of "The Vampire Diaries."

"[Nikki] goes to set every day," a source previously told the magazine.

Celebrity Dirty Laundry reports that Dobrev is trying to remain professional but finds it difficult to do so with Somerhalder's girlfriend around.

"Our sources are also adding that Nina's enjoyment of working on the series has swiftly come to an end," the site wrote. "For one thing, it's Season 6 and she's tired of working on the same TV show... And for another, she just really, really doesn't want to work on the set with her ex-boyfriend and his new girlfriend anymore."

Reportedly she's trying to get producers to ban Reed from the Atlanta set. E! News previously reported that out of the three main stars - Somerhalder, Dobrev and Paul Wesley - only two had signed contracts for Season 7.

A source told the site that the star who hadn't signed a new contract wasn't sure if he or she wanted to return.  Warner Bros. refused to comment on the rumor but source told E! that producers are thinking about shifting the focus from the main stars to other characters for Season 7.