"It's more than just a fling," one insider close to 31-year-old Stacy Keibler, a former WWE wrestler who competed on season two of Dancing with the Stars.
Stacy Keibler and the Oscar-winning hunk, 50, have known each other "four or five years," the insider adds, and recently "reached out to one another through a mutual friend."
Since becoming romantic, the pair have been spending time together in London and at Clooney's Lake Como spread in Italy.
"They're basically exclusive at this point," explains the insider. "They like each other's sense of humor. Obviously they're both physically attracted to one another."
George Clooney and Italian actress/model Canalis, 32, called it quits in late June -- amid talk that she was anxious to marry and have a child, while he resented her attention-hogging habits.
After five years together, Keibler parted ways with 7th Heaven actor Geoff Stults in mid-2010.
