Adelaide Kane has joined the cast of hit U.S. medical drama Grey's Anatomy.

The Australian actress, 31, will play an idealistic doctor-in-training with a troubled family past, reports Deadline.

Adelaide rose to fame on Aussie soap Neighbours and is best known to international audiences for playing Mary, Queen of Scots, in the historical drama Reign.

Adelaide's character, Jules Millin, is the daughter of hippie parents whose drug use created household havoc while she was growing up.

According to the official synopsis, Jules has her 'heart in the right place' when she arrives at Grey Sloan Hospital to begin her residency.

But since she had to care take of herself and her parents while she growing up, Jules can be a little bossy. 

Fans can expect to see Jules get into trouble, since she is unafraid to break the rules.

Adelaide will join the 19th season of Grey's Anatomy, a show that helped bolster the careers of stars including Katherine Heigl, Sandra Oh and Patrick Dempsey.

Debuting in 2005, Grey's Anatomy is set in a fictional hospital in Seattle and centres on medical residents as they battle life-and-death issues amidst personal challenges.

Beginning her career on Neighbours in 2006, Adelaide later moved to Los Angeles to pursue an acting career in the United States.

She earned plaudits for her role of Mary, Queen of Scots, in Reign, which aired on The CW network in the U.S. and on Stan in Australia.

Adelaide also starred in ABC's Once Upon a Time and the CBS series SEAL Team.