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Two weeks after announcing the arrival of their new baby girl, Nicole Kidman, 43, is opening up about her family's newest addition.

Although Kidman and husband Keith Urban kept their lips sealed at the Golden Globes two weeks ago, the couple had just welcomed Faith Margaret via surrogate on December 28.

"I wanted to be able to tell everybody because I was so excited about her," Kidman told E!'s Giuliana Rancic on the red carpet at the Screen Actors Guild Awards on Sunday. "But at the same time we just decided that this was about being together."

As for choosing Faith as the name, the Rabbit Hole star said it was a natural choice. "We needed to have that through the whole pregnancy," she said. "That's what it required -- a lot of faith."