Madonna, 51, may be mulling adding to her ever-expanding family yet again. "Never say never," Madonna tells Britain's GMTV of rumors that she planning to adopt. "I'm really proud of the work that I'm doing in Africa. I feel a tremendous sense of accomplishment in terms of my career and the work that I have done. I have four children now and I'd like to think I'm a good mother. I feel a great sense of satisfaction in all areas of my life." The singer has already adopted son David and daughter Mercy from the African nation of Malawi. (Photo: WENN)