The star is seen sporting a bump at the American Music Awards
The actress looked glowing with health and suited the fuller figure, which has set tongues wagging in Hollywood.
Pictures show Nicole cradling her small bump, then holding a finger up to her lips for waiting photographers.
Definitely keeping something a secret then!
So could there now be a sibling on the way to complete the picture?
What do you think of the rumours? Let us know your thoughts in the comments box below.