Organisers of the People's Climate March in Manhattan said they are expecting several Hollywood stars to attend, including DiCaprio and his 'Shutter Island' co-star Ruffalo, reported New York Daily News.
The event is being billed as the biggest march for climate action in history.
DiCaprio, who was made a United Nations Messenger of Peace on Climate Change this week, and 'Lost' star Lilly will join an expected crowd of more than 100,000 for the march.