Mel Gibson and Nadia Lanfranconi
Ramey; Giulio Marcocchi/Sipa USA
09/26/2012 at 06:00 AM EDT
Embattled actor Mel Gibson
partied at AV Nightclub in Hollywood on Friday.
The Get the Gringo
star arrived just before midnight with a car full of girls, including the actor's rumored girlfriend, Nadia Lanfranconi.
Lanfranconi, who was dressed in a short black and white dress and knee-high black boots, and Gibson looked "very happy," an onlooker tells PEOPLE.
"Mel was smiling, laughing and talking with friends all night," the source adds. "He even chatted with guests waiting outside in line!"