Paquin is expected to play the adult version of Joanie Lockhart, Alison and Cole Lockhart's daughter, reports people.com.
The season's upcoming ten episodes will also let the characters explore how "everything does really fall apart in the end, but somewhere in that wreckage, the seeds of change finally sprout," according to a press release from Showtime obtained by Entertainment Weekly.
"To say we're happy to welcome Anna Paquin, would be the understatement of the century," she tweeted.
"Been a huge fan of hers for as long as I can remember. We can't wait to show you all this final season."
In response, Paquin echoed her thrilled message and shared that she was looking forward to joining the cast. "Super excited to join you all"
News of Paquin joining the cast comes after it was announced over the summer that Ruth Wilson would not be returning for the show's final season. Her departure left fans speculating about the real reason as to why she chose to move on.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)