The 40 year old reveals she happily agreed to pose for the veteran guitarist, who is also an accomplished painter, until she realised he wanted her to strip off completely for the portrait.
The singer admits she was too embarrassed to consider Wood's offer at the time, but she has since had second thoughts.
Knight tells Britain's Sunday Mirror, "One time he talked about painting me. I was well up for it, then he said he wanted to paint me naked. I was quite embarrassed. But I think I may be brave enough to do it now. I'd be nervous to get my kit (clothes) off in front of Ronnie. Maybe it would be better if he was naked too? Or would it?"