Ian Somerhalder and Nina Dobrev Master the Art of Sneaky PDA in Bel Air
04/24/2012 AT 06:00 AM EDT
"They sat together at dinner, and when Ian noticed Nina was shivering, he offered her his blazer to keep her warm," an onlooker tells PEOPLE of the event, co-sponsored by VeeV. "There was no overt PDA, but there was a certain lovey way about how they looked at each other."
Following a show by graffiti artist Erik Wahl, the pair quietly slipped away for a little one-on-one time during a tour of the mansion where the event was held.
"They were holding hands during the tour," the source says. "They seemed very close and comfortable together."
– Dahvi Shira