So which celeb is sporting this baby bump but hasn't made an official pregnancy announcement yet?  Not that there's any doubt there's a bun in that oven... 

It's Naomi Watts, who is reportedly expecting her second child with actor Liev Schreiber.  The couple have a son Alexander, 1.

The Aussie actress has never officially confirmed her pregnancy, but don't expect much fanfare when she does.  When Watts was pregnant with Alexander, Schreiber just casually mentioned on Conan O'Brien's show, "Yes, I'm going to be a dad."

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