Friday, April 4
(Undated) -- Fans and celebrities alike are tweeting their appreciation for David Letterman. The iconic CBS host announced his plans to retire last night, which sparked an outpouring of support. President Obama, Ellen DeGeneres and Donald Trump were among the many well-wishers. Jimmy Kimmel called Letterman "the best there is and ever was." The "Late Show" host says he will take his final bow sometime next year.