Jerry Buss -- I'M HIS SECRET LOVECHILD ... Woman Claims

The war over Jerry Buss' fortune just took a shocking turn -- with a mysterious woman claiming she's the secret daughter of the late Lakers owner ... but Jerry's family is calling B.S.

According to heavily redacted legal docs filed in L.A. County Superior Court, the woman describes herself as an "omitted child" ... who is entitled to just as much of Jerry's estate as his other 6 children.

It appears from the docs that the woman claims she's the oldest of Jerry's children ... but all of the details about why she's convinced she's the fruit of his loins is redacted in the legal papers.

However, the woman has met staunch resistance from Jerry's most famous daughter, Jeanie Buss -- who filed legal docs of her own calling the woman a liar who deserves JACK SQUAT.

Of course, Jerry was reportedly worth in excess of $600 million -- so there's a lot of money on the line.