Mädchen Amick ( MAYD-chən AY-mik; born December 12, 1970) is an American actress. She is best known for her starring role as Shelly Johnson on the cult television series Twin Peaks (1990–1991), its prequel film Twin Peaks: Fire Walk with Me (1992) and its revival television series Twin Peaks: The Return (2017). She was also a series regular on Central Park West (1995–1996), Freddie (2005–2006), and Witches of East End (2013–2014). On the big screen she had starring roles in Sleepwalkers (1992) and Dream Lover (1993). She was also playing a minor role on the hit show Gossip Girl. She currently portrays Alice Cooper, the mother of Betty Cooper, on The CW's drama television series Riverdale (2017–present).