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Dahvi Shira and Wendy Grossman
December 14, 2010 12:10 PM

Girls just wanna have fun.

Fresh off the heels of a widely seen video that showed Miley Cyrus smoking the sage Salvia from a bong, 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.”

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The real fun started for Cyrus when a song from fellow pop star 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.”

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