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The rumors that Kate's knocked up with A-Rod's baby are false, says her rep.

Brad Cafarelli told Gatecrasher that reports that Kate's expecting a little A-Rod are false, despite the fact that pix of her looking a bit plumper are making the rounds.

But sometimes being happy can make you gain weight, and X17online can exclusively report that when we spotted the happy couple out at Giorgio Baldi last week, Kate was drinking wine!

So what's in her belly is most likely a meatball - not a little ball of joy!