Count on Britney Spears to steal the spotlight at a soiree, even when she's not even doing anything.
Brit, along with dad Jamie Spears, made a late appearance at Phil Maloof's Beverly Hills music-label bash for the Rev Theory band Wednesday night.
"The Spears family is very close friends with the the Maloof family and vice versa," a source tells E!. "They came out to support them."
The popster arrived around 11:30, as the party was dying down, and held court in a roped-off VIP room at the front of the house.
"It was like an exhibit at a zoo," says another partygoer, Katie Thiele. "There was a line of people waiting to look in and see the Britney exhibit."
Britney, who was drinking Coke and smoking, didn't seem fazed. But one unwelcome party guest got under her dad's skin.
A paparazzo snuck in to the private party - meant to celebrate the band's appearance on Jimmy Kimmel Live - posing as an event photographer. Brit's dad quickly recognized the snapper and told him to leave.
"He said, 'You're just like Adnan,' " a source tells E!.
Brit, wearing a black minidress, seemed to be enjoying herself, despite the party-crashing pap. "She looked great," Thiele says. "She was chatting with friends. She looked like she was having a good time."