Vice President Kamala Harris’ husband is being accused of slapping his ex-girlfriend for flirting with another man at a ritzy gala in 2012, a new report claims.

Second gentleman Doug Emhoff, 59, supposedly struck his then-girlfriend — a successful New York attorney — in the face so hard, she spun around while in a valet line after an event at the Cannes Film Festival in May 2012, three unnamed friends of the woman reportedly told the Daily Mail.

The woman — who was identified only as Jane — allegedly called one of the friends sobbing in her cab immediately after the incident, the outlet said.

A second friend claimed that Jane — who had been dating Emhoff for about three months at the time — also told her about the incident, the Daily Mail claimed.

A third acquaintance alleged that Jane told her about what happened in 2018, when then-Sen. Harris was in the news for grilling Supreme Court nominee Brett Kavanaugh over sexual assault allegations, according to the Mail.

All three sources requested not to be named due to fear of retaliation from Emhoff, the Daily Mail said.

They shared a series of photos showing Emhoff posing with the woman in 2012, as well as other documents that the Daily Mail claimed corroborated some of the details of the incident.

Emhoff and Harris met on a blind date set up by a friend in 2013. They married a year later.

The ex-girlfriend declined to comment on the story, the outlet said.

The Harris campaign did not immediately comment on the report.