Marissa Mowry was sentenced to 20 years in prison. - Pic source: tampabay.com

A WOMAN in the US state of Florida who gave birth to an 11-year-old boy's baby has been sentenced to 20 years in prison for sexual battery.

Marissa Mowry, 28, pleaded guilty to the crime and her fate was handed down in Hillsborough County Courthouse on Wednesday.

Mowry was working as the boy's live-in nanny when she had sex with him in Jan 2014.

At the time, she was 22 and the victim was aged 11.

In October of that year, Mowry gave birth to the boy's son – but his unsuspecting parents had no idea.

They believed Mowry's boyfriend was the father of the child, and she stayed working at the family home.

Mowry abused the boy at least 15 times over the course of several months, according to WFLA.

He did not report what had happened to him until 2017, at which point Mowry was arrested.

The victim – who is now aged 17 – appeared at the sentencing with his and Mowry's 5-year-old child.

Mowry was initially facing life in prison before she struck a plea deal. She will also have to register as a sex offender when she is released from jail.

The boy's mother spoke outside the courthouse and said parents should be warned about the dangers of “female predators”.

She added that she has been left betrayed by the acts of abuse.

“I thought of her (Mowry) almost as a second daughter,” she told WFLA.

The family even went to visit Mowry in the hospital after she had given birth – with a chilling photo obtained by that news network showing the young victim holding his infant son.

“It cost my son his childhood. He's not going to know his teen years like a normal teenager,” the victim's mother added.

The teen is now in his senior year of high school, juggling his school commitments with raising his young child.

The victim's mother says he is excelling at fatherhood.

Meanwhile, WFLA reported that Mowry has also given birth to another baby from another teenage boy she is accused of sexually abusing. No charges appear to have been filed in relation to that case. – Daily Mail