Who On What Tonight? Your Guide to Late Night TV (Monday, June 18, 2012)

CONAN O'BRIEN: How I Met Your Mother's Martin Short, Safety Not Guaranteed's Aubrey Plaza, music group Spring Standard
DAVID LETTERMAN: The Amazing Spider-Man's Denis Leary, People Like Us' Olivia Wilde, music group the Pierces
JAY LENO: A Friend at the End of the World's Steve Carell, Newark Mayor Cory Booker, musician Glen Hansard
JIMMY KIMMEL: REPEAT
JIMMY FALLON: Comedian Joan Rivers, wrestler CM Punk, musician Fiona Apple
CRAIG FERGUSON: Brave's Kelly MacDonald and Kevin McKidd