Madonna's Stepmother Joan Ciccone Dead at 81 After Cancer Battle

Madonna's family is in mourning ... because her stepmother has died. The "Like a Virgin" singer's stepmom, Joan Ciccone, died Tuesday after a battle with a very aggressive cancer ... according to her obituary. Joan was Madonna's housekeeper growing up in Michigan ... and a couple years after Madonna's mother died at age 30 -- also from cancer -- Joan married Madonna's father, Silvio Ciccone. Joan and Silvio had…