Colleen Ann Fitzpatrick (born July 20, 1970 in Old Bridge, New Jersey) is an American pop music artist, dancer and actress, better known by her stage name, Vitamin C. Her hits include "Smile", "As Long As You're Loving Me", "Graduation (Friends Forever)" (which reached #38 on the Billboard Hot 100), "The Itch" and "Vacation" (from the Pokémon Pikachu's Vacation soundtrack).

Before going solo, Fitzpatrick was the lead singer of punk pop band Eve's Plum. She is currently recording her third album.