Marissa Mowry of Port Richey and the victim were at a Hillsborough County residence in January 2014 when they had sexual intercourse that resulted in a pregnancy, according to officials.
Upon her arrest Tuesday afternoon at Busch Gardens theme park in Tampa, where she works as a waitress, Mowry was charged with sexual battery and transported to the Hillsborough County Jail.
The crime apparently happened in 2014 and Hillsborough County Sheriff's deputies said the baby boy was born later that year.
According to ABC Action News, Marissa's boyfriend was almost in tears when he spoke to a reporter in the wake of Mowry's arrest.
Marissa Ashley Mowry, 25, of Port Richey, is facing one count of sexual battery on a victim younger than 12 years of age.
In October 2014, Mowry gave birth to a child who is now 3, deputies said.
At the time, Mowry was 22-years-old and the victim 11-years-old.
Mowry is held at the county jail without bail.