Someone do a DNA test, because Mary-Kate and Ashley Olsen are supposedly fraternal — aka, not identical — twins. Madness. (That means their song “Identical Twins” off their hit record, Brother For Sale, was a lie.) They certainly look enough alike to pass for each other, and we have a hard time telling who is who. After some scientific calculations; many years of watching Full House, Passport to Paris, and So Little Time; and a little help from this video, we think we may have cracked the code on how to tell the Olsen twins apart.
Check their hands.
Mary-Kate is left-handed; Ashley is right-handed. If you see a twin holding a gargantuan coffee in her left hand, it’s likely MK.
Find a freckle.
Browse their brows.
This mostly helps the twins are side-by-side, as both girls keep their brows pretty well groomed, but Mary-Kate keeps her brows a bit thinner.
Do a fashion check.
The designers have different styles. While Ashley opts for more simple, feminine ensembles, Mary-Kate piles on the accessories, often wears darker colors, and is edgier.