Jessica Keenan Wynn (born Jessica Keenan Armstrong; June 12, 1986) is an American actress. She is known for her roles as Heather Chandler in the off-Broadway production of ' and Young Tanya in Mamma Mia! Here We Go Again. She is a successful voice-over artist and looper in New York City.
Wynn is the daughter of Edwyna "Wynnie" Wynn and Roger Armstrong. Her legal surname is Armstrong. She uses Wynn to carry on the name in show business: she is the niece of actor Ned Wynn and screenwriter Tracy Keenan Wynn; the granddaughter of Keenan Wynn, after whom she was named; the great-granddaughter of comedian Ed Wynn; and the great-great-granddaughter of Frank Keenan, all of whom were prominent actors. The Wynn family is considered an acting dynasty in Hollywood, alongside The Barrymores.