Vampire Diaries' Ian Somerhalder, Nina Dobrev Pack on PDA

Ian Somerhalder, 32, couldn't keep his hands off his Vampire Diaries costar Nina Dobrev, 22, when the two strolled hand-in-hand during a Parisian vacation on Tuesday. The notoriously private pair, who visited the Saint Germain des Pres with their mothers, were later spotted dining at a local bar as throngs of fans gathered in the streets to catch a glimpse of the CW stars."Thank you for the warm welcome," Somerhalder tweeted later that afternoon. "It's really amazing."Despite their PDA-packed outing, the two have yet to publicly confirm their relationship. "We expected the rumors. Like, if I wasn't dating Ian, I'd be dating Paul [Wesley]," Dobrev told Teen Vogue in April. "A lot of people who work together end up dating, so it wouldn't be unusual, but I've never dated anyone I've worked with."