News just came down that legendary comedienne Joan Rivers has passed away at the age of 81. Take a moment to remember this remarkable talent with some highlights from her gig as guest host of "The Tonight Show."

As much as I loved Johnny Carson, I always enjoyed it when Joan Rivers would guest host. Her sharp wit was a nice balance for the late night scene.

Rivers first appeared as a guest on The Tonight Show on February 17, 1965, when Johnny Carson was still relatively new to the show. By 1983, she was appearing on The Tonight Show regularly as a guest host.

Joan Rivers passed away today from serious complications including cardiac arrest following a recent surgery.