"He's enjoying spending time with Stacy, but he just got out of a two-year relationship. George isn't ready for anything serious. This fling is purely for fun."
Keibler's time on Dancing with the Stars earned her the nickname "The Weapon of Mass Seduction" by judge Bruno Tonioli.
George, 50, is one of Hollywood's most famous bachelors and recently blamed his work commitments as the reasons why his relationships don't work.
George - whose previous girlfriends have included model Lisa Snowdon and waitress Sarah Larson - said: "I love working. I love being on a film set, trying to make something special. It is a very selfish life.
"It means my relationships seem to last between two and three years. At that point, these independent women think it is time to call it a day. They see me travelling round, putting work first, writing, directing, acting. It seems I never stop.
"I don't blame them for wanting more from a relationship."
- BANG! Showbiz