How many movies have Joan Rivers and Lily Tomlin acted in together?

They have worked on 3 movies together! Their first movie together was Lily: Sold Out (1981) while their highest rated movie together was George Carlin : The Kennedy Center Mark Twain Prize (2009). They have not worked together since George Carlin : The Kennedy Center Mark Twain Prize (2009). They are most known for their comedy films together.