Shannen Doherty shaves her head during cancer battle

SHANNEN Doherty has shaved her head.

The former 'Beverly Hills 90210' actress - who was diagnosed with breast cancer last March - documented cutting off her long locks on Instagram on Tuesday evening, with her mother Rosa and friend Anne Kortright-Shilstat by her side for support.

As well as pictures of her getting her head shaved, Shannen initially posted a photo of a cupcake tin, a box of chocolates and a shaver and wrote: "Cupcake pan, chocolates and a razor.... Stay tuned. @annemkortright has got this. #cancersucks #thankgodforfriends (sic)"

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A photo posted by ShannenDoherty (@theshando) on

Meanwhille, Anne praised her friend's "strength and courage" as she thanked the 45-year-old star for "trusting" her with the clippers.

Alongside a photo of them together, she wrote on her own Instagram page: "I couldn't be prouder of you today. Your strength and courage is so inspiring and I am so very lucky to have you in my life. Thank you for blindly trusting me today to help you with such a big step. I will forever be there for you no matter what. #f**kcancer (sic)"

Shannen's diagnosis was made public in August 2015 after she filed a lawsuit against her former management and accounting firm, Tanner, Mainstain, Glynn & Johnson, who she took action against for allegedly failing to pay her SAG [Screen Actor's Guild] medical insurance without her knowledge.

In court documents, the actress accused the firm of ignoring an invoice to pay her insurance premium in early 2014.

The 'Charmed' star re-enrolled in the program this year shortly before doctors discovered she has "invasive breast cancer metastatic to at least one lymph node."

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A photo posted by ShannenDoherty (@theshando) on

Her medical team believe the cancer spread last year and would have been easier to treat if it had been detected earlier, but she failed to get a check-up at the time due to her lack of insurance.

Confirming the news at the time, Shannen vowed to remain positive.

She said: "Yes, I have breast cancer, and I am currently undergoing treatment. 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."