We're not sure if she was just joking when she made the claim during her An Evening With Katie Price event in Liverpool on Wednesday…
According to The Sun, Katie told the packed audience: "Sometimes I have to Google their dates of birth but I probably shouldn't admit that."
Katie is mum to five kids: son Harvey, 14, from her relationship with Dwight Yorke, son Junior, 11, and daughter Princess, nine, from her marriage to Peter Andre, and son Jett, three, and daughter Bunny, two, from her union to Kieran Hayler.
A quick Google shows the birthdays listed as:
Harvey: 27 May 2002
Junior: 13 June 2005
Princess: 29 June 2007
Jett: 16 August 2013
Bunny: 4 August 2014
Katie's been on a roll lately with several quotable comments while promoting seventh autobiography Reborn, which is out now.
She's also treated us to a comparison of her exes' penis sizes, the declaration that her boobs are so big she ripped her shirt, and joking about having a threesome with a young X Factor duo.
But despite the fun interviews and laughs, the book she's promoting is actually quite dark and harrowing: Reborn deals largely with her discovery that third husband Kieran had been cheating on her and how they worked past it to save their marriage.
In an interview with Reveal magazine this week, the 38-year-old told us she couldn't even read back the chapters she'd written about discovering Kieran had been sleeping with her best fiend Jane Pountney.
"I knew I needed to get those chapters done quickly and I didn't read it back. I still can't. The rest of the book is fine but I still can't read that chapter," she admitted.
She added of her decision to give Kieran a second chance: "It's easy to walk away. It takes a stronger person to stay and deal with it. That's what I did and it's the best thing I did."