Seattle Smooth is a thoroughbred mare bred in Kentucky by Dr. Oscar Benavides in collaboration with Darley Stud. Seattle Smooth's dam is the unraced mare, Our Seattle Star, by Seattle Song who was bred to Quiet American; a Grade 1 winner by Fappiano who was in turn sired by the great Mr. Prospector. Being sired by Quiet American makes her-half sister to Kentucky Derby and Preakness Stakes winner Real Quiet, who lost the 1998 Triple Crown by a nose.