Six Weeks Before Giving Birth To First Child:

In other breaking news, it has been reported that Nicole, like her pregnant predecessors Demi Moore, Britney Spears and Christina Aguilera, posed nude on Wednesday, May 21. She arrived at Smashbox Studio to work with famed photographer Patrick Demarchelier. No news yet on which magazine will be publishing the photos.

I think that she's in need of some press and wants more $$ for those first baby pics. God, I love Hollywood...
(Source)