It's a family affair!
Kimberly Stewart celebrated her 33rd birthday with dad Rod, stepmother Penny Lancaster and brother Sean at Bootsy Bellows in West Hollywood on Friday night.
In a curve-hugging black dress, Kimberly chatted with friends while Rod kept a low profile. The 67-year-old rocker didn't move from his seat when the DJ played his 1978 hit, "Da Ya Think I'm Sexy?"
Benicio del Toro, who has a daughter, Delilah,
with Kimberly, also joined the soiree briefly. He arrived with a few pals, wearing a baseball cap.
"The two seemed to be on good terms and got along well," a source tells PEOPLE. "Although he didn't stay for long, clearly he was there to make an appearance for Kimberly."
The festivities wrapped up around 1:15 a.m. when the Stewart family parted ways.