"Whose doing the Moonwalk tonight??" Tweeted Dawn. "I feel like sponsoring someone £50..."
Author Dawn's avid fans were quick to retweet her message, which struck a chord with Hayley Johnstone who is taking part with her mother Jane.
"Me & my mum are doing it," said Hayley in reply to the TV presenter. "In memory of our best friend!"
Hayley's tweet and dedication to the cause, which sees hosts of women, often dressed in their bras, taking part in a nighttime charity marathon, was enough for Dawn to sponsor Hayley on her fundraising web page.
"GOOD LUCK to you guys." posted Dawn, along with her donation. "I'll be thinking of you. Let me know how it goes tomorrow x x."
Dawn's contribution helped Hayley and her mother reach their total target of £400.