The two ladies have joined Arlene Philips, Jo Wood and Kimberley Walsh and signed up for the Children in Need BearFaced campaign.
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They all posed for a make-up-free photoshoot with famed photographer Rankin to help highlight the worthwhile appeal.
The initiative encourages women to be a natural beauty on Friday 8 November, by going without make-up and wearing a cute paw print face transfer instead. The paw print transfers are available in post offices throughout the UK.
"There are so many children and young people across the UK who need our help, so how could I say no to the BBC Children in Need BearFaced campaign," said Welsh TV star Alex, 36. "Join me and hundreds of other women going Bearfaced on 8 November."
Former Strictly judge Arlene said, "Come on ladies, join me in going BearFaced on Friday 8th November to help raise lots of money for BBC Children in Need.
Jo Wood added, "I'm so excited to be taking part in BBC Children in Need's BearFaced campaign this year! I hope that women across the UK will leave the make-up at home for the day to help change the lives of children who really do need our help."
Last year's BearFaced campaign featured stars including Heidi Klum, Lulu, Louise Redknapp, Abbey Clancy, Julia Bradbury and Caroline Flack.