02/24/2013 at 04:00 PM EST
We're not in Hogwarts anymore.
made an unexpected appearance at Bootsy Bellows in West Hollywood on Friday night. Arriving with a male pal around 1:40 a.m., the Harry Potter
star was "in party mode but really friendly," an onlooker tells PEOPLE.
Wearing a long-sleeved black shirt and jeans, the actor hung out at a table in the club's back VIP room, where he made himself vodka cocktails.
As DJ BeeFowl spun hit after hit, Radcliffe "started singing and dancing at the table to Nelly's 'Country Grammar' and 'Ride Wit Me'," the source adds. "He introduced himself to people at his table casually as 'Dan.' "
As the evening progressed, Girl Meets World
star Ben Savage chatted up Radcliffe and the two shared a laugh.
The next song to make Radcliffe dance was Nirvana's "Smells Like Teen Spirit."
The source adds, "He was very happy-go-lucky," and Radcliffe "posed for a few photos and stayed at the club until closing time."
– Jennifer Garcia