George Clooney and Stacy Keibler

The couple have been dating for almost two years and friends believe their romance has lasted this long because they don't live together.

A source said: "She still has her own place in LA. She thinks it's best not to give it up completely and George agrees. She never goes there. She practically lives at George's - that's definitely a sign he's committing 100 per cent to her."

Although Stacy, 32, doesn't officially live with the 52-year-old actor, George has made changes to his pad to make the ex-WWE wrestler feel comfortable.

The source added to Life and Style magazine: "He had a mega closet built for her. She's such a big part of his life now that he's customising his home to fit their needs as a couple. It's very sweet!"

It was recently reported that one of the things the Hollywood heartthrob likes most about Stacy is her independence because too many of his ex-lovers suffocated him.

An insider previously said: "She goes off and does her own thing whenever George is spending time with his pals or is deep into a film project - she doesn't even call him. But eventually, he starts missing her and he's the one who calls. She lets George come to her."