Kate is heading back to work as a radio present at Virgin Radio 3 next month and felt "guilty" asking other mums how much time they took off work.
"I already regret not taking longer maternity leave. I wish I had taken proper time off everything," she wrote on her Instagram stories.
"I'm going back to Virgin Radio in 3 weeks and on top the other work I do on here etc it's such an overwhelming feeling.
"I just don't want to leave Noa. I thought I'd feel different. I really did. Everyone tells me, 'once you're back at work you'll feel like you again'... did you?"
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She then felt even worse once her fans started sharing the amount of time they had taken for maternity leave and left her "feeling more guilty than I already did".
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The former Big Brother champ has won praise from fans for her candid documenting of motherhood, but she has also been targeted by cruel mummy-shamers over the past 12 weeks.
She appeared to pre-empt backlash while posing with her booze, writing: "Pumped. Wine time. Just a teeny one before anyone tells me I'm about to turn Noa into a p*** head."