Was doing a little digging around on Photobucket and found this rare autographed picture of Nancy. I'd say it was taken between the 4th and 6th seasons. I am going to keep the other comments to myself...:D

http://i45.photobucket.com/albums/f91/kaylyne/facts%20of%20life/NMposterfullsmall2.jpg

Hot photo! Those girls really should have showed off more. The Facts of Life wasn't the sexiest show on tv...

The only picture to my knowledge of Jo in a pair of Daisy Dukes...