She tells rock magazine Mojo:
"I have to say the best experience I've ever had was when I had to take morphine in a hospital, when I had two Caesareans.

Oh and also I fell off a horse and broke 10 bones and I got morphine then too, and, well, that's just a wonderful feeling.
But then after 24 hours, the nurses stop giving it to you and the pain comes crashing back in.