"We just decided that this was our thing together," the actress revealed. "It kind of just perpetuated itself, and so then at the end we just went, 'OK. We'll make an announcement.' " She also filled us in on how the couple chose the baby's name.
"Because we needed to have that through the whole pregnancy, actually. I mean, that's what it required—a lot of faith," the actress told us. "Her name's Faith Margaret...that Southern double name, and Margaret's my grandmother's name. She had her last baby at 49! So she's my inspiration."
Check out the video to hear what else Kidman had to say about her SAG style, her growing family and why her hubby let her do this red carpet interview solo.