She cracks herself up, too
DeGeneres donated a set of matching clothing to McKinnon during their initial interview and the impressionist re-emerged at the end of the show in full-Ellen mode.
A silly farewell and, of course, dancing ensues as the two funny ladies double team the audience.
McKinnon, who debuted as a featured player on "SNL" last April, has made a name for herself by doing over a dozen celebrity impressions, including Penélope Cruz, Shakira, Jodie Foster, and during the last election season, Ann Romney.
Watch what happens when two Ellens walk into a television studio: