June 16, 2021 | 4:46pm

Luann de Lesseps should probably run some laps after messing up this bad.

The “Real Housewives of New York City” star appeared to confuse special education with physical education, aka gym class, in an undated video she made for a fan.

“You teach special ed. That’s fabulous,” the 56-year-old countess said in the clip, which was reposted by the Instagram account Xanax Smoothies. “I love special ed because I’m a jock at heart. I love sports.”

The video was apparently made for a special education teacher who lives in New Orleans and is originally from Chicago.

Several critics took to the the comments section to rip de Lesseps for her blunder.

“Physical Ed and special Ed are two very different things mam,” one person commented.

“What the f–k ma’am ..” wrote someone else.

“She is so embarrassing 😭,” another person added.

Ironically, de Lesseps has defended her own level of education in the past.

In a “RHONY” episode that aired earlier this month, she jabbed Eboni K. Williams after the lawyer defended their co-stars’ candidness about sex.

“It has nothing to do with class, it has to do with education,” de Lesseps said.

When Williams, 37, suggested that she herself was the “smartest person” within the group, de Lesseps went on the offensive.

“So you think your degree makes you more educated? That’s probably the stupidest thing I’ve ever heard anybody say,” she fired back.

De Lesseps also told the former Fox News host, “Don’t come into my house and tell me I don’t have an education.”