Shortly after the incident, Guardiola married the teenager, who has not been identified, in Las Vegas with the approval of her mother, who witnessed the wedding.
Police said there is circumstantial evidence that the two engaged in a sexual relationship prior to legal marriage.
"The marriage is absolutely legal. We received a copy of the marriage certificate," said Gary Finkelman of the Spring Valley Police Department.
Guardiola was arrested on Thursday at his Houston-area apartment for violating a Texas law that forbids sex with a child, regardless of the child's consent. A child is defined as a person under 17 years of age.