Nixon, 58, joined the actual Charlotte, Kristin Davis, 60, on the most recent episode of her Sex and the City rewatch podcast, Are You a Charlotte?, where she explained the hilarious case of mistaken identity that briefly led her to believe she would be appearing opposite Thomas in the show’s 1998 pilot.

Cynthia Nixon revealed to "Sex and the City" co-star Kristin Davis on Monday that when she joined the HBO comedy as Miranda, she thought another famous "Kristin" had been cast as Charlotte: "I didn't know who you were,

Cynthia Nixon knew Sarah Jessica Parker and Kim Cattrall before signing on to 'Sex and the City,' but was convinced Kristin Davis' part had actually gone to Kristin Scott Thomas prior to filming the pilot.