Robert Pattinson's Flirty Night Out with Dylan Penn
11/08/2013 AT 04:15 PM EST
The two were spotted getting cozy at the Spare Room in the Hollywood Roosevelt Hotel on Wednesday night to celebrate Angie Banicki's travel memoir, 30 Before 30: Traveling Under the Influence.
"The two chatted and flirted inside," an onlooker told PEOPLE. "They were a little cautious, making sure people noticed they did not come together."
He showed up with close pal Nick Jarecki while Penn, who is the daughter of Sean Penn and Robin Wright, arrived separately with a group of her own friends.
"They were chatty and flirty in the beginning, but by the end of the night he was in the corner with a friend and she was talking to Michael B Jordan," said another party goer.
Overall, "Rob was being social," the onlooker said. "Girls were chatting him up. He and Dylan were very kind and chatty but definitely made a point to keep things a bit separated."
A pal told PEOPLE that Pattinson has been "dating around."
For the latest on Pattinson's relationship with Stewart and Penn, pick up PEOPLE magazine's newest issue on stands Friday