Jessica Keenan Wynn (born Jessica Keenan Armstrong; June 12, 1986) is an actress and singer known for her roles as Heather Chandler in Heathers: The Musical and Young Tanya in Mamma Mia! Here We Go Again. 　　Wynn is the granddaughter of Keenan Wynn, who is her namesake, the great-granddaughter of comedian Ed Wynn and performer Hilda Keenan, and the great-great-granddaughter of Frank Keenan, all of whom were prominent actors. She is the niece of screenwriter Tracy Keenan Wynn.