(TMZ) - Snooki is plumping up again ... but not 'cause she's eating too much -- the "Jersey Shore" store is having another baby!

Snooks is reportedly a few months pregnant but is keeping things under wraps so it doesn't torpedo some lucrative appearances she has lined up -- according to Page Six.

Sources close to the couple told TMZ a similar story this week ... but the celeb website got radio silence from her camp.

Great timing ... Snooki just penned a book called Baby Bumps about her first pregnancy in 2012.

Looks like Lorenzo is going to be a big brother!

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