Getty

Robert Redford has died ... and celebrities are reacting to the sudden loss of the legendary actor and director. Gallery Launch Gallery

The tributes poured in Tuesday morning, with Hillary Clinton saying she "always admired" the "true American icon." She applauded him for the causes he supported, writing ... "He championed progressive values like protecting the environment and access to the arts while creating opportunities for new generations of activists and filmmakers."

Meryl Streep said in a statement to TMZ ... “One of the lions has passed. Rest in peace my lovely friend.”

Meanwhile, Piers Morgan listed some of his favorite movies in which Redford starred -- "Butch Cassidy and the Sundance Kid," "The Sting," "The Way We Were" and "All The President's Men."

See Full Page