Take a close look at this picture of Nicole Kidman -- is that a baby bump?

The stunning mum of daughter Sunday Rose, born in July, strutted into the Aussie premiere of "Australia" and set tongues wagging.

If she is expecting baby number two with hubby Keith Urban, it's no surprise -- she said earlier this week, "I'm in a place in my life where I have had some great opportunities. I may just choose to have some more children."