Kaylee DeFer (born September 23, 1986 Tucson, Arizona, U.S.) is an American actress who made her acting debut in the television series Drake & Josh (2004). She is known for her role in The CW's teen drama series Gossip Girl and made her first film debut Underclassman in 2005 acted in a small role. Kaylee DeFer also casted in television episodes like The Mountain, How I Met Your Mother and The War at Home.