Showbiz
Jim Smeal/BEI/Rex Features
The actor, who plays Carrie's lover Mr Big in Sex and the City, welcomed Orion Christopher into the world in LA on Friday.
His spokesperson told People that the baby weighed in at 7 pounds, 10 ounces.
Noth, 53, is currently shooting the Sex and the City movie alongside Sarah Jessica Parker.
He also stars as Detective Mike Logan in NBC's legal drama Law & Order: Criminal Intent.
Parker told Entertainment Tonight: "I'm thrilled for him because I think, first of all, he's going to make a wonderful, wonderful father.
"He's found a lovely lady to have a child with. It's the perfect time for him and I think he's very ready."
More: Showbiz
More Showbiz News
Ten Things About...
Ten Things About... Ridley ScottWe find out ten fast facts about the English producer and director.
Interviews
'Angels' Share' Ken Loach interviewKen Loach, Paul Laverty and Paul Brannigan on their whiskey-soaked comedy.
Fashion & Beauty
Duchess of Cambridge's memorable momentsFlick through a gallery of Kate Middleton's stand-out public appearances.
Celeb Birthdays
Marilyn Monroe: Life and career in picsFlick through our gallery on what would have been Marilyn's 86th birthday.
