Ashley Greene and Adrian Grenier Get Cozy
06/16/2009 AT 01:25 PM EDT
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