In a Facebook Q&A with fans, Nicks says: "I probably wouldn't be a judge on The Voice. It takes a lot of time, and there are so many things I want to do over the next 10 years.

"If you work on one of those shows, you are invested in it, and they spend a lot of time - half a year - of solid work, and you really can't be taking off on tour. Most people can't give up that time, for anything."

She adds: "I will probably never write a tell-all book. All the people I would talk about are still alive, and probably wouldn't be happy about it, so I wouldn't do that to them. Some day, when we're all very old, I will write the story in a very kind, calm, fun and romantic way. But not for a long time."