Robert Pattinson Sans-Girlfriend, Not Dating Imogen Ker? Kristen Stewart Heartbreak Leaves 'Twilight' Hottie Single, Parties with Ryan Rottman on July 4th

Rumors initially suggested that "Twilight" heartthrob Robert Pattinson was dating stunning model, Imogen Ker. But did ex-girlfriend Kristen Stewart's shady infidelity leave the British actor totally hopeless in the romance department?

The 28-year-old "The Rover" star hasn't been involved in a serious romantic relatioship since breaking things off with K-Stew a couple years ago. He was recently spotted hanging-out with 22-year-old blonde cutie, Ker. But are the two just good friends - like always!?

R-Patz partied with "The Lying Game" actor Ryan Rottman on July 4th at Malibu's infamous nightclub 1OAK. The celeb-studded bash included appearances by Chris Brown, Jamie Foxx, Paris Hilton, Brody Jenner, Elle Fanning, and Tyga (just to name a few). But Pattinson's new "sweetheart" was nowhere in sight.

In fact, Pattinson kept a low-profile the entire evening.

"He was wearing a hat and trying to stay undercover," a fellow partier tells E! News. "He hung out at a corner table and was flirtatious with multiple girls all night. He stayed through the performances and was really enjoying himself." 

The source continued, "Rob seemed extremely into the music, smiling and dancing nearly the whole time."

At leas the "Maps to the Stars" hottie seems to be enjoying the single life with his pals! But do fans think R-Patz should just forget about Stewart, and finally move-on?