The 40-year-old posted a bare-faced picture of herself, adding that she is "always late to the party", reported Contactmusic.
The no-make-up-selfie trend has raised a lot of money for the charity, named Cancer Research UK, with USD 13 million accumulated so far.
British model Amy Willerton and opera singer Katherine Jenkins have also joined in to raise money for the charity.
A Japan Maritime Self-Defense Force AP-3C Orion arrives back at RAAF Base Peace after continuing the search for debris or wreckage of the missing Malaysia Airlines Flight MH370 in Perth, Australia. (AP)