I remember watching Ellen DeGeneres perform standup on HBO back in the 80's. And back then, all she had to do to get George Clooney was visit the set of Facts Of Life.
TRANSCRIPTION COURTESY OF JOSEPH HOUK - [1987; CW catches Ellen DeGeneres at the Improv!] (CW) "Ellen? Hey! I loved your show, I laughed my ass off all night!" (ED) "Aw, thanks, I'm glad you liked it!" (CW) "I certainly did... I'm a huge fan of yours, I watched all those HBO shows you did!" (ED) "Well, color me flattered. I appreciate you coming out!" [Freudian slip?] (CW) "No problem. You know, maybe one of these days you'll get your own star-studded talk show!" (ED) "Ha! That's real sweet of you, but... I really can't see myself doing the whole Johnny Carson thing!" (CW) "Well, just make it your own thing... Maybe even dance around a little..."