The former Spice Girl – who had a cameo role in the original US TV series - was overcome when she watched the film because it triggered all of her emotions.
She said: "I've seen 'Sex and the City' twice already. It pushed all the buttons – it made me laugh, made me cry. To be honest, I felt quite traumatised by it all.
I think I'm quite sensitive when it comes to engaging with other people's energies and emotions. And yet it's things like characters in books and films that help me work out my own stuff in life."
Geri, 35, also said the movie reminded her of her recent reconciliation with the Spice Girls.
The star – who quit the girl group in May 1998 to pursue a solo career - added: "In a way, seeing the four women in 'Sex and the City' and how the story of their lives had moved on reminded me of the Spice Girls and how we've moved on.
The Spice Girls reunion tour was a very healing experience for me. It put to bed every bit of doubt, guilt, insecurity I had about leaving the girls when I did. I felt I'd made amends with them."
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