Brad Pitt, Robert Redford at Telluride Film Festival

Actor Brad Pitt made a surprise visit to the 40th Telluride Film Festival, showing up after a screening of the film "12 Years a Slave," in which he appears and helped produce.

After the film, Brad took to the stage for a Q&A along with the film's stars; Michael Fassbender, Chiwetel Ejiofor, and Lupita Nyong'o.

Michael talked about working again with British director Steve McQueen on "12 Years," after their collaboration on "Shame" and "Hunger."

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Robert Redford also attended the festival and received its Career Achievement honor, the Silver Medallion.

Redford spoke about his latest film, "All Is Lost," in which he plays a man who is lost alone at sea.