Claire (played by Catriona Balfe) and Judith are reported to be become embroiled in a vicious spat and while the reason why has not been revealed, it could be down to Philip’s crush on the time traveller.
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.
Outlander: Claire Fraser will have a new rival in the form of Judith Wylie
Outlander: Claire and Jamie Fraser will spend season four in the American colonies
“But what a nice surprise! Excited for Judith to dip her toe into the Outlander gang.”
Ainsley has previously starred in a number of plays and movies as well as narrating her own radio show “Kidnapped”.
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.
Outlander: Jaime and Claire washed up on the shores of Georgia in season three
It is believed that he will lead Jaime and Claire to the sawmill where a lynching takes place in the fourth run of the time-travelling series.
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: How will the couple cope in the American colonies?
After surviving a storm and ship wreck, the couple have found themselves washed up on the shores of the American Colonies.
Outlander season four is expected to return to Starz later this year, and will follow on Amazon Prime Video shortly after.
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