updated 03/20/2011 AT 10:00 PM ET
•originally published 03/21/2011 AT 9:00 AM ET
It wasn’t an intimate, one-on-one dinner date, but Scarlett Johansson and Sean Penn seemed very much a couple when they joined a small group of friends for dinner Saturday night in West Hollywood.
“They were smiles all night and seemed to have a great time together,” a source at the restaurant tells PEOPLE. “Scarlett and Sean sat very closely and exchanged flirty looks.”
Johansson, 26, and Penn, 50, enjoyed an Italian feast at Cecconi’s West Hollywood, where they shared pasta and fish dishes washed down with wine, a source tells PEOPLE.
Adds the source: “Scarlett acted very intrigued by him. She would smile, nod her head and just listen to his stories.”
Talk of a budding romance heated up when the two took a short and sweet getaway to Mexico at the beginning of January.
In February, a rep for Johansson told PEOPLE the pair are “nothing more, nothing less” than friends.