Girls just wanna have fun.

Fresh off the heels of a widely seen video that showed http://www.people.com/people/miley_cyrus smoking the sage Salvia http://www.people.com/people/article/0,,20448642,00.html, the former Disney star, 18, wasted no time hitting the club circuit with her So Undercover costar Kelly Osbourne.

"It was a good, old-fashioned girl's night," a source tells PEOPLE of the two gals, who along with pal Alexis Knapp and two other women, arrived at the New Orleans club Republic at 1:30 a.m. Saturday. "They were just dancing and hanging out. Miley was drinking Red Bulls."

The real fun started for Cyrus when a song from fellow pop star http://www.people.com/people/lady_gaga came on at the club.

"[Miley] went nuts dancing," the source says. "[the group] was really nice and great to the staff. They kept saying how they want to come back. They were really polite ... and saying they had such a wonderful time."

SOURCE:PEOPLE