TMZ: OctoMom is being sued ... but the person behind the lawsuit is keeping their identity a secret!!!

Mega-mouthpiece Gloria Allred is letting everyone know she has been hired in a secret case against Nadya Suleman, but she won't reveal who her mysterious client is or what she is suing over. That is, not until she holds a press conference today at 11:30 AM PT to give away all the juicy details.

All Gloria will say is that she is doing it "in an attempt to protect Nadya Suleman's children."

Selfless as always.

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