Will Ferrell was the lord of the tight pants on Fallon last night.

Tonight on late night:
Tommy Johnagin on The Late Show with David Letterman (CBS 11:35PM)
Jenna Fischer on The Tonight Show with Jay Leno (NBC 11:35PM)
Stephen Colbert on Late Night with Jimmy Fallon (NBC 12:35AM)
Anna Chlumsky and Larry King on The Late Late Show with Craig Ferguson (CBS 12:35AM)