Christopher G. Ciccone (born November 22, 1960 in Bay City, Michigan) is a younger brother of Madonna, and has worked as Madonna's assistant, dresser, backup dancer, stylist, and artistic director. His first public appearance was alongside his sister in her 1982 debut music video "Everybody". After involvement in a promo tour for her debut album, he appeared in her 1984 "Lucky Star" video. He has decorated Madonna's various former residences in New York City, Los Angeles, and Miami. He has also designed the stage for her 1990 Blond Ambition concert tour, and directed her 1993 Girlie Show concert tour. He is an artist, director and interior and furniture designer by profession.

He is also co-author of the book Life with My Sister Madonna which has sparked controversy due to claims about Madonna's personal life. In the book, he criticizes her lifestyle, saying that she is a "control freak," narcissist, and cheapskate. Madonna had responded time and again, accusing him of being a habitual drug addict even claiming that during her tours that he would regularly do lines of cocaine backstage. He also criticizes Madonna's ex-husband Guy Ritchie, saying Ritchie's homophobic attitude strained the openly gay Ciccone's relationship with his sister. He further criticizes Madonna's Kabbalah faith, saying that it has validated her negative behavior, and he claims that she has tried to extort him into joining the religion.

Released on July 14, 2008, the book debuted at #2 on the New York Times Best Seller List, and reached #16 on Amazon.com's bestseller list, and #26 on barnesandnoble.com's bestseller list.