Jessica Simpson, Luke Wilson Hit Louisiana Hotspot

By Mark Lambert

12/02/2006 at 04:25 PM EST

Jessica Simpson and Luke Wilson, who are costarring in Blonde Ambition being shot in Shreveport, La., were spotted checking out a local hot spot on Thursday night, sources tell PEOPLE.

The pals arrived at the upscale club Phoenix Underground so early that there were more employees there than patrons, according to a source at the club.

"Luke was there the night before, and he wanted to show the place to Jessica," the source says. "She was very friendly to everyone."

Phoenix Underground is a 14,000 square-foot club that was once a bank; it's dance floor used to be the bank's vault. Wilson spent about four hours there on Wednesday evening, according to the source.

At the club, Jessica posed for pictures and chatted with people for about a half hour before leaving with her costar. Their movie, Blonde Ambition, has been described as a remake of the 1980s movie, Working Girl.