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Tracey Crouch, the MP for Chatham and Aylesford, has tweeted a picture of herself and her sister, both with shaved heads.
Miss Crouch is currently undergoing chemotherapy after an operation for breast cancer.
Her sister, a local primary school teacher, volunteered to adopt the new cropped look by having her own hair shaved off and donated to The Little Princess Trust to turn into wigs for children similarly under-going chemotherapy treatment.
She raised £1,440 in sponsorship for the charity at the same time.
Miss Crouch described her as "my beautiful baldy twin and the best sister I could ever wish for."
And the MP also thanked the hair-dresser at Smartys salon in Lenham who carried out the cut.
The former sports minister, 45, a mum of one, has been open about her cancer condition from the start , posting regular updates on social media.
She believes in doing so she will encourage other women to examine themselves and seek medical help at an early stage if they detect anything wrong while there is a good chance of a successful outcome.
She said: "If you have a platform, like we do as politicians, it is important to use it."
She has held Chatham and Aylesford for the Conservatives since 2010.