A pair of coworkers whose many similarities helped them form a fast friendship were surprised to learn recently that their "twin" nicknames for one another were quite accurate, considering they're actually biological sisters.

Julia Tinetti, 31, and Cassandra Madison, 32, first met in 2013 as coworkers at the Russian Lady Bar in New Haven, Connecticut, Madison explained on Facebook.

They had plenty in common, including matching Dominican Republic flag tattoos as a tribute to the country they'd each been adopted from, and soon struck up a close friendship.

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"We become friends, start wearing matching clothes, having a blast together and telling everyone, 'We're sisters,'" Madison wrote.

A resemblance between the two inspired them to compare adoption papers, but the documents didn't match up, according to Good Morning America.