Sir Ian McKellen, Mary Berry and Rita Ora are among the celebrities putting pen to paper to raise money for a Leeds-based epilepsy charity.
A host of stars have donated drawings for National Doodle Day, in aid of Epilepsy Action.
Other famous faces showing off their artistic side include Michael Sheen, Lorraine Kelly, Sir Terry Wogan, Joanna Lumley, Louis Smith, Matt Lucas, Gok Wan, Dev Patel, Alan Titchmarsh and Chris Tarrant.
The celebrity doodles will be auctioned on eBay from National Doodle Day on February 8, until February 17.
Members of the public are also invited to join in by entering their own drawings in this year's National Doodle Day competition.
Schools, workplaces and groups can also take part, with prizes on offer for the winning doodlers.
"Absolutely anyone can take part so please get doodling with your schoolmates, friends, family or colleagues, or bid on your favourite celebrity doodle. It really will make all the difference in helping us to create a brighter future for people affected by epilepsy."
The closing date for entries is March 8 and there is a suggested minimum donation of £1 for each entry. To order an organiser's guide or to enter the competition, visit www.nationaldoodleday.org.uk.