A MAN and his biological daughter who are reportedly "planning to get married" are facing incest charges after they allegedly had a baby together.

Steven Pladl, 42, of Wake County, North Carolina, gave up Katie Pladl for adoption as a baby but she contacted her parents through social media when she turned 18, police said.

6 Steven's wife - Katie's mum - reported the sick relationship to local cops

She went to live with her biological parents and their two children near Richmond, Virginia, in August 2016 before the couple legally separated three months later, according to WNCN.

The wife, who has not been named, told authorities her husband would sleep on the floor of Katie's room in the months before she moved out.

In May last year, she read in one of her children's journals that Katie was pregnant with her father's baby and that Steven had told his other children to call Katie their stepmother, according to the arrest warrant.

When his wife confronted him, Steven allegedly confirmed he had impregnated their adult daughter and that they planned to marry.

6 The pair allegedly had a baby together in late 2017

6 Steven Pladl is facing charges of incest after allegedly getting his biological daughter pregnant Credit: Wake County Sheriff's Office

6 Katie Rose Pladl, 20, was arrested after she allegedly began a sexual relationship with her own father Credit: Wake County Sheriff's Office

6 The twisted pair uploaded this image to social media, suggesting they were married. However, they legally cannot wed Credit: Instagram

6 Their baby has since been taken into care Credit: Instagram

A week later the pair moved to Wake County and in November last year a warrant was issued for their arrest.

They were located at an address last week, where officers discovered a baby boy who is understood to be four-months-old.

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Steve and Katie Pladl were held at the Wake County Detention Center pending extradition to Virginia and charged with incest with adult, adultery, contributing to delinquency.

Court records Steven was released on a $1 million bond while Katie, issued with the same bond, remains in jail.

According to the warrant, they are due to make their first court appearance on Monday.

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