Sarah Jessica Parker looked like a proud mother as she introduced her twins to the world on The Late Show with David Letterman.

The six-month-old tots, born through a surrogate, have not been seen in public since they appeared with Parker on the cover of People magazine in the summer.

"They are physically, intellectually, spiritually, geographically, politically, ideologically, religiously, as different as two small 6-month-olds could be," Parker said.

Wearing a low-cut top, the Sex and the City actress revealed that one of the twins was a Republican.

But she added that she and husband Matthew Broderick were “used to a divided house”.

In a recent interview with Glamour magazine, Parker, 44, also revealed that the couple were not pushover parents.

She said she and her husband, who also have a son, James, did not want their children to feel like they have “a sense of entitlement”.

On the set with Sex and the City