Childs said she was shocked when Walsh appeared clueless about the intimate female beauty trend on an episode of The X Factor, declaring that she would soon "educate him" on the treatment.
"I couldn't believe Louis Walsh didn't know what a vajazzle was," she wrote in her New column.
"I actually know Louis quite well so when I see him next, I'm going to educate him on vajazzling. He won't know what's hit him."
Childs also said that she was "so excited" by Essex-born X Factor contestant Amy Mottram, whose sparkly trainers prompted Walsh's vajazzle admission.
"I picked her to win a singing competition that I was judging a while ago and she was brilliant," the Celebrity Big Brother housemate revealed.
"She's a lovely, talented girl and I think she'll go really far."
Watch Amy Mottram's X Factor audition below: