Cynthia Nixon saw costar Kristin Davis's first name and thought Kristin Scott Thomas was playing Charlotte in the 'Sex and the City' 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,

The actress starred alongside Sarah Jessica Parker, Cynthia Nixon and Kim Cattrall in the series, which ran from 1998 to 2004.

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.