(Cover) - EN Showbiz - George Clooney's rumoured romance with Stacy Keibler appears to be heating up after she was pictured visiting him yesterday and seems to have spent the night.

The 31-year-old former WWE wrestler was seen driving through the gates of the actor's home in Studio City in her black SUV.

Us Weekly are reporting that as of Monday morning Stacy had not yet been seen leaving the property.

Sources confirmed to the publication that George has quietly been dating Stacy since he broke up with girlfriend of two years, Elisabetta Canalis.

"It's more than just a fling," a friend of Stacy said and added that the pair had known each other for "four to five years".

The couple also reportedly spent time together in London recently, enjoyed time at George's Italian home in Lake Como and now in America.

"They're basically exclusive at this point," the source added.

Stacy took to her Twitter account to gush about how much she enjoyed her trip to Italy. "I'm in heaven," she wrote. (C) Cover Media