A white teacher fired from a Westchester County private school for staging a “mock slave auction” has now been suspended by Mount Vernon school officials — who hired her ignorant of her controversial past, according to a report.

Rebecca Antinozzi was axed from the ritzy Chapel School in Bronxville earlier this year — only to get a job teaching at the Cecil H. Parker Elementary School in Mount Vernon, where 86 percent of students are black, The Journal News reported.

School officials acknowledged they had no clue about the controversy until parents tipped them off.

“I feel like they completely betrayed us with this hiring,” Mount Vernon parent Nadia Mondesir told the newspaper. “You’re supposed to be aware of cultural things. You should be aware that having a slave auction could have an effect on kids, black or white.”

Schools Superintendent Kenneth Hamilton said he sent Antinozzi home — with pay — “once this information reached my attention.”

Antinozzi came under fire in March, when the furious parents of three black students in her fifth-grade social studies class complained about the mock auction — which had black students placed in imaginary chains while classmates were encouraged to bid on them.

The controversy cost the teacher her job and sparked an investigation by state Attorney General Letitia James, who reached an agreement to have the teacher undergo a series of racial reforms.

Mount Vernon, a predominantly black city in southern Westchester, hired her Sept. 17 as a non-tenured teacher.

“This is unacceptable,” a petition posted on Change.org said. “The community demands that Superintendent Hamilton remove Rebecca Antinozzi as an employee of the (school district).”

Hamilton said he did not know how long it would take to resolve Antinozzi’s employment gaffe, saying she is entitled to due process and “I’m sure he is seeking legal representation.”

Antinozzi could not be reached for comment.