Emily Lawrance has been cast in the role of Sienna, the twin sibling Dodger knew nothing about.
Dodger (Danny Mac) learns about Sienna for the first time after he manages to track down his biological father Patrick Blake played by Jeremy Sheffield.
Sienna has been tipped to cause mayhem when she arrives in the soap next month.
Lawrance revealed: “Joining Hollyoaks is going to be fun and a great experience for me. It goes without saying that working with Jeremy is brilliant.”
Earlier this year, Dodger was rocked by the discovery that Dirk (David Kennedy) is not his real father, the revelation has since put a strain on their relationship.
Patrick and Sienna make their Hollyoaks debut next month.