Actor Ian Somerhalder reunited with his ex-girlfriend Nina Dobrev on Thursday (16May13) for the first time since news of their split became public last week (ends10May13). The Vampire Diaries co-stars kept it professional as they attended The CW network's Upfront event in New York to present the channel's upcoming slate of programmes, joining company president Mark Pedowitz onstage to greet the audience. A source tells Usmagazine.com, "They flanked him on each side, said 'hi' to the audience and walked off stage, leaving Mark to deliver his address to advertisers. As they walked off stage, Nina was a stride or two ahead of Ian." Somerhalder and Dobrev ended their romance after three years together.