Dressed inconspicuously in a grey hoodie and jeans, 26-year-old Pattinson snuck into the fav celebrity haunt Teddy's at the Roosevelt Hotel in Hollywood in the early hours of Saturday morning.
And Twilight costar Stewart -- Rpatz's on-again, off-again girlfriend since 2008 -- was nowhere in sight, an eyewitness exclusively tells RadarOnline.com.
"He went straight to the back and commandeered a corner table," the source says.
"There were a bunch of gorgeous models standing around him, but he looked disinterested in them. He was sitting with another male friend. He almost seemed timid and shy."
KStew's non-appearance at the nightspot alongside her British heartthrob comes just 24 hours after we reported that Pattinson wanted "room to breath" from his girlfriend.
“Kristen wants to spend every minute with Robert... She’s even talked about attempting to take summer off to spend every day with him," a source told us. "He was happy that Kristen made such an effort after he returned to the States; she rallied all their friends together for a big welcome back party and Robert was touched by the gesture.
“But, he’s still very cautious when it comes to fully committing himself to her and she’s being really clingy right now."