She tells Britain's Heat magazine, "I'm attached. It's been about two years now. That's a part of me that I do try to keep private. It's something I cherish. He's visiting me here (in the U.K.) but we don't parade out.
"I'm very happy with him. He's a very successful musician, but that's all I have to say."
When asked by the magazine's reporter whether they will wed soon, Williams replied: "Yes, definitely."