Doherty displays a range of emotions in the powerful black-and-white photos, which show her cutting off her long black hair and allowing Kortright to shave the rest.
Many fans commented on the pictures, thanking the actress for sharing her journey and leaving messages of support.
Before the process began, Doherty posted a picture of chocolates, cupcake pans and a razor, telling her followers to “stay tuned.”
Kortright also shared a photo of the two, applauding her friend for her “strength and courage.”
Doherty first opened up about her cancer diagnosis in 2015 after legal documents surfaced revealing she was suing her former business manager for not paying her insurance premiums, which prevented her from receiving medical care during that time.
The actress told People, “I am continuing to eat right, exercise and stay very positive about my life. I am thankful to my family, friends and doctors for their support and, of course, my fans who have stood by me.”