Photo Credit: VENTURELLI/WIREIMAGE;JASON LAVERIS/FILMMAGIC
Keibler, a former WWE star and Dancing with the Stars contestant, was noticeably absent from the red carpet functions at the Venice and Telluride Film Festivals where Clooney was promoting his two new films, The Descendents and The Ides of March.
However, Clooney and Keibler will both be in Los Angeles this week, before Clooney jets off to the Toronto International Film Festival, and People's source says the pair will squeeze in some quality time then.
Keibler and Clooney have known one another for about five years, and hooked up after each ended long-term relationships -- Clooney with Italian model-actress (and now Dancing with the Stars contestant) Elisabetta Canalis, and Keibler with actor Geoff Stults.
"They're basically exclusive at this point," a source says of George and Stacy. "They like each other's sense of humor. Obviously they're both physically attracted to one another."
Clooney, who is one of Hollywood's most eligible serial monogamists, has said he doesn't know if he ever wants to get married again. But it's easy to see why he's smitten with Keibler: In addition to being gorgeous, she's not afraid to be one of the guys.
"Anybody that knows me knows that I'm definitely a guy's girl," she tells People. "I just can really adapt to any kind of environment. So I can get all dressed up and have a great girls' night out, and then can also be playing beer pong with the boys."
What's more, Keibler claims she's low-maintenance. "I'm always happy," she says. "Anybody that knows me knows that I'm a very happy person."
Perhaps Clooney and Keibler can find some of that happiness together this week playing a good game of beer pong.