Will Smith and Helen Mirren want you to join them in their fight against homelessness.

The Oscar-nominated actor and Oscar-winning actress are teaming up with “The World’s Big Sleep Out” campaign. People all around the world will sleep outside on Dec. 7 to raise awareness for the homeless.

RELATED: Will Smith Developing ‘Fresh Prince Of Bel-Air’ Spinoff 

“Think for a minute about what home means to you,” Smith said. “To me, home means conversation. It’s the place where my family comes together, and that’s the most beautiful part of home. But there are over 100 million people in the world that don’t have a place to call home.”

“We are hoping for 50,000 people to sleep out in the world’s largest display of solidarity and support for homeless and displaced people,” Mirren added. “Major sleep out events will be happening in Trafalgar Square, in Times Square, and in 50 cities across the world.”

RELATED: Helen Mirren Loves Jason Momoa

Event organizer Josh Littlejohn said the goal of the event is to “walk in the shoes of people that we would normally walk past.”

Smith will read a bedtime story to participants in Times Square in New York. Mirren will appear live in London’s Trafalgar Square and Coldplay frontman Chris Martin is also expected to make an appearance while other artists will perform stripped back acoustic songs.