The 36-year-old shared an email conversation which showed the mums discussing donations for their children's birthday presents.
Former Hear'Say singer Myleene mocked the women, labelling them 'bonkers' and sent a hilarious reply.
But the angry mums have blasted the Classic FM presenter, claiming the whole thing was a publicity stunt.
According to reports, when Myleene picked up daughter Ava, seven, from school yesterday, one of the mothers shouted: "Why did you do it, Myleene? Why?"
But Myleene refrained from getting into a scrap at the school gates, replying: "If you've got a problem with it, talk to me in private."
The Ham and High claimed furious parents swarmed to send emails to the school over Myleene's 'cheap shot'.
One parent allegedly emailed: "She has really p*ssed everyone off. It is so out of order. She isn't going to have any friends left and we are ones she relies on to pick up her daughter for her when she is late."
Another is said to have added: "Next time she parks on the double yellow lines opposite the school, I shall try really hard not take pictures and sell it to the press."
And one parent claimed Myleene was looking for attention. They said: "It is bang out of order. These are old class emails from a year ago. We have all noticed that the paparazzi are no longer outside the school taking her picture like they used to be every morning.
“Perhaps she needed to get some attention. The press have certainly all been back here today.”
Do you think Myleene was right to shame the mothers?
See also: Myleene Klass hits out at school mums for 'bonkers' donation email