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Published 17:50 21 Jul 2014 BST
Updated 06:17 18 Dec 2014 GMT
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The Strictly Come Dancing winner isn't the only famous face backing the campaign.
Scottish Songstress Nina Nesbitt and TV presenter Gethin Jones also got in on the action.
Rankin said: “It’s important to remember that, for those affected by cancer, long-standing changes to appearance such as hair loss, such as hair loss are a day-to-day reality.”
The charity encourages people to donate £3 to the campaign by texting STYLE to 70550.
Images via The Daily Mail. Celebrity