Mary-Kate and Ashley Olsen  have been working together their whole lives, but they haven't made a joint TV appearance in four years. They returned to the small screen for a fun interview on The Ellen DeGeneres Show (airing today) — which happens to be the last place they appeared together in September 2010 — and played a game of "me or her." Their knowledge of one another was tested with quick-fire questions ranging from first kisses to best dancers. The twins, who admitted they still get confused for one another, tackled each inquiry with giggles. Check out the clip above to see the Olsens in action, and then take a walk down memory lane with some of their sweet throwback photos .
Front page image source: Michael Rozman/Warner Bros.