Riley Keough

Riley Keough was snapped out and about for the first time since a bombshell lawsuit allegation claiming she's the biological mother to John Travolta's youngest son ... and TMZ has the shots. Check out the pics ... Riley seemed to be in good spirits, doting on her kids among Christmas lawn…

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. Priscilla Presley's former business partner, Brigitte Kruse, is currently suing Priscilla's son, Navarone Garcia, for…