Celebrities React to the Death of Joan Rivers

LOS ANGELES, CA - JUNE 20:  TV personality Joan Rivers performs onstage at An Evening With Joan Rivers at American Jewish University on June 20, 2013 in Los Angeles, California.  (Photo by Michael Kovac/WireImage)
Photo: Michael Kovac/Getty

Joan Rivers passed away today at the age of 81, and stars of all stripes — from Samuel L. Jackson to Donald Trump — took to Twitter to pay their respects to the pioneering comedienne and red carpet legend, and to share tributes and remembrances.