Leighton Meester Snuggles with Adam Brody in Venice
02/24/2013 AT 03:20 PM EST
Just after 6 p.m., Brody – who wore a red sweatshirt – and Meester – who dressed in an oversized cardigan – met up with a pal at La Fiesta Brava, a local Mexican restaurant.
An onlooker tells PEOPLE that both Brody and Meester ordered enchiladas while chatting about film with their friend. "She sipped on a Mexican coke and sat back smiling and listening to the boys," the source adds.
As the meal came to a close, the boys split the check – although Meester offered to contribute. But before it was time to leave, the couple shared a romantic moment.
"Adam put his arm around Leighton and the two smiled at each other while she snuggled into his chest before the trio headed out," the source says.
– Jennifer Garcia