British author Sophie Kinsella, whose real name was Madeleine Wickham, died at 55 after a three-year battle with aggressive brain cancer, glioblastoma.Her family announced she passed peacefully, surrounded by loved ones, highlighting her resilience and passion for family, music, and Christmas.Kinsella, best known for her "Shopaholic" series, sold over 50 million copies globally, with her novel "Confessions of a Shopaholic" adapted into a popular 2009 film.