Katie, who is pregnant with her fourth child, is mum to Peter's son Junior and daughter Princess, and she has spoken openly about her battle with the mental illness following their births.
But after reports that a £10 test would soon be available to spot warning signs of post-natal depression, former glamour model Katie seems to have poked fun at the Andre family.
Writing in her column for The Sun, Katie said: "I was one of the one in seven women who suffer from depression after giving birth.
"But I'm sure I know the cause. It wasn't my genes – it was the in-laws!"
Katie married her third husband, Kieran Hayler, in January. They are now expecting a baby together and, along with Katie's son Harvey, it will bring the total number of kids in her brood to four.
Katie has deliberately gone out of her way to hide her baby bump throughout this pregnancy – which she has also described as her "worst" due to sickness and low iron counts.
Yesterday, Katie covered her bump in a giant pair of lips while launching her perfume Kissable: By Katie Price. She was later pictured covering up in a giant black scarf.
Speaking to Reveal, she said: "I've not shown my bump once in this whole pregnancy, it just goes to prove you can keep things private."
Watch our exclusive interview with Katie Price below: