Ashley Greene and Adrian Grenier
06/16/2009 at 01:00 PM EDT
Dancing close, surfing and snuggling: It sounds like a Hollywood movie, but it was real life for Ashley Greene and Adrian Grenier, who spent the weekend getting cozy in Santa Barbara, Calif.
The Twilight actress and the Entourage hunk met for the first time Friday during the welcome dinner at Oakley's "Learn to Ride" surf weekend – and were practically inseparable until Sunday, a source tells PEOPLE.
"They hit it off," says the source, who saw the pair dancing together to music by Kelley James on Friday night. "[They] really had a great time."
On Saturday, Greene and Grenier hung out and talked before taking surf lessons. That night, they met up at a barbeque at El Capitan Ranch and "were flirting and dancing close all night long," says the source. "They held nothing back dancing – it was pretty intense."
Other stars who enjoyed the weekend of fun in the sun – and who stayed at the Bacara Resort – were Lo Bosworth, Mario Lopez and Benji and Joel Madden. But it was Greene and Grenier who sizzled.
"[They] got super cozy all weekend. They were very cute," says the source. "They were hanging out nonstop and they only met Friday. They spent the whole time together – surfed together – everything."
Reporting by JENNIFER GARCIA