United Kingdom, Dec. 18 -- Priscilla Presley has blasted claims Riley Keough is the biological mother of John Travolta's teenage son.

The 80-year-old ex-wife of Elvis Presley has responded after a lawsuit filed by her former business partner Brigitte Kruse over their finances, who has alleged that Michael Lockwood - the former husband of Riley's mother Lisa Marie Presley - told her the now 36-year-old actress gave up one of her eggs to the Grease star, 71, and his late wife Kelly Preston in exchange for a payment between $10,000 and $20,000, and an "old Jaguar" car.

In a statement, Riley's grandmother Priscilla's attorney Marty Singer said: "Brigitte Kruse, Kevin Fialko, and their co-conspirators have demonstrated that there is no bar t...