Dawson was fascinated by Internet images of people lying face down and still - like a plank of wood - at landmark sites all over the world and now she has started trying it out.
During an appearance on "Jimmy Kimmel Live!" on Thursday, Dawson "planked" on the stunned host's desk and revealed she's hooked on playing dead in public and becoming part of the planking community.
She said, "We've got some stuff up our sleeves, like, there's competition happening between our groups... What we're really trying to do is plank for peace... It's a whole new cause... We're planking all over Los Angeles. It's genius."
Dawson regrets the fact she didn't know about planking when she hit the catwalk for a charity fashion show at the Cannes Film Festival in France last month.
She adds, "If I had known about planking I would have planked on the runway. That would have been really, really cool."