David Hockney, Fred and Marcia Weisman.  Sadly, they split.
{"Image ImageDescription": "David Hockney American Collectors (Fred and Marcia Weisman)", "Image DateTime": "2011:09:17 15:27:25", "Image Artist": "Pamela Schreckengost", "Image Copyright": "(C)2010 {Pamela Schreckengost}, all rights reserved"}