The new addition is also rumoured to have something to say about Claire’ fashion sense as she adjusts to life in the American colonies.
Ainsley said that she is very “excited” to be joining the cast of Outlander and took to Twitter to thank the show’s fans for their warm welcome messages following the announcement that she would be taking on the role of Judith.
It comes after it was revealed that Jaime Fraser (Sam Heughan) could also have a rival as Scottish actor Craig McKinley has joined the cast.
The Glaswegian star has previously appeared as Sir Percival in King Arthur: Knights of the Round Table as well as television series Nightfall and short film Blood Loss.
Outlander cast spotted filming in park near Glasgow
Outlander season four is expected to return to Starz later this year, and will follow on Amazon Prime Video shortly after.