Madonna is to host a star-studded event in New York on Wednesday (6Feb08) to raise money for Unicef (United Nations Children's Fund) and her Raising Malawi Orphan Care Initiative. Nelly Furtado, Timbaland, Alicia Keys and Rihanna will perform for guests including Lucy Liu and Tea Leoni, in a Gucci sponsored 42,000 square foot tent at the United Nations building.