Sen. Claire McCaskill says her son once dubbed her the “best prostitute in Kansas City.”

The Missouri Democrat and mom of three recalled Thursday on MSNBC’s “Morning Joe” when her then-school-age son got a little mixed up about his mother's profession while completing a class assignment.

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“He was confused,” McCaskill, 62, told host Joe Scarborough. “He was writing a paper. He was in the second grade. I explained to him that I was a big prosecutor in Kansas City — how great I was.”

McCaskill served as a county prosecutor in the Show Me State in the 1990s.

“And he, accidentally, when he wrote the paper, said I was the best prostitute in Kansas City,” McCaskill, who penned a book last year called “Plenty Ladylike,” said with a laugh.

“It’s in the scrapbook,” the lawmaker added. "He was confused and the teacher thought it was hysterical. And obviously it was."