updated 01/30/2011 AT 7:40 PM ET
•originally published 01/30/2011 AT 7:55 PM ET
“I wanted to be able to tell everybody because I was so excited about her,” Kidman told Giuliana Rancic on the red carpet at the Screen Actors Guild Awards.
Why keep it a secret?
“We just decided this was our thing together,” Kidman, 43, said of keeping the news quiet with hubby Keith Urban. “It kind of just perpetuated itself.”