Katherine is the eldest daughter of her parents. She joined Penrhos College where she received her primary education. After that, she commenced secondary schooling at St Hilda's. Later, she was enrolled at Perth Modern School where she studied music and drama and was also sports captain and a nationally ranked swimmer.
Initially, Katherine was interested in medicine and politics. At the age of 16, she attended Lady Gaga's concert, the Born This Way Ball, which inspired her to learn to play the piano. Later, she became successful in a number of musical eisteddfods and drama competitions. After she completed her graduation in musical theater, she was offered a spot at the Western Australian Academy of Programming.
Katherine made her acting career in a short movie, Daughter in which she played the role of Scarlett. After a year, she appeared in an American mystery teen drama web television series, 13 Reasons Why, which was developed by Brian Yorkey. The co-stars of this series are Miles Heizer, Kate Walsh, and Dylan Minnette.
Recently Katherine appeared in American romantic comedy-drama movie, Love, Simon which has been directed by Greg Berlanti. The co-stars of this movie are Nick Robinson, Josh Duhamel, and Jennifer Garner. The total budget for this movie is $17 million. The movie was released on March 16, 2018, by 20th Century Fox.
Katherine is an Australian by nationality and belongs to white ethnicity. Currently, she is single and wants to keep her personal profile, related to her boyfriend and affair, out from the reach of the media. Once she was rumored to be in a relationship with her 13 reasons Why co-actor, Dylan Minnette. However, the rumors faded away as the season ended. She has not yet married. Thus, talking about her husband or divorce is irrelevant. She also doesn't have any children.
Most of Katherine income comes from her acting career. Her annual salary is estimated to be $1 million. She has also invested $1.5 million in an entertainment industry. She has a collection of luxury cars including Mini Cooper & Cadillac worth $290,000. She has also bought an apartment in Australia by paying $0.6 million. According to some source, her current net worth is estimated to be $4.6 million.?