Nicole Julianne Sullivan (born April 21, 1970) is an American actress, voice artist, comedian, screenwriter and producer. Sullivan is best known for her six seasons (1995–2001) on the sketch comedy series MADtv along with voicing Shego in Kim Possible. She also played the role of Holly Shumpert for five seasons (2001–2005, 2007) on the CBS sitcom The King of Queens.
For Nickelodeon, she voiced Marlene in The Penguins of Madagascar.