John Travolta Youngest Kid Is Riley Keough's Biological Son, Lawsuit Claims

 John Travolta and his late wife, Kelly Preston, had three children together ... but their youngest kid is biologically a Presley ...

 this according to a bombshell legal document.

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Priscilla Presley's former business partner, Brigitte Kruse, is currently suing Priscilla's son, Navarone Garcia, for breach of contract ... but what's way more interesting in new legal docs filed in the case is that Kruse alleges John and Kelly used Riley Keough's eggs to give birth to their son, Ben.