According to Heat, the star would prefer to mark her split from cheating husband Kieran Hayler.
An insider told the mag: "Katie is threatening to call off her 40th altogether as she's miserable.
"She says she doesn't feel like there's anything to celebrate.
"She's blaming Kieran and now she'd rather throw a party to celebrate her divorce from him than mark getting old."
The mum-of-five, who turns 40 on May 22, has been linked with footballer Shane Duffy after her car was spotted outside his house last week.
Our exclusive picture appeared to confirm love rat Kieran’s fears that Katie, 39, could have taken revenge on him with a romance of her own.
It comes after The Sun told how Kieran, caught cheating three times by Katie, feared she had grown close to the Republic of Ireland defender.
Along with her crumbling marriage, Katie has also been struggling to cope with her mum Amy's diagnosis with idiopathic pulmonary fibrosis.
There is no cure for IPF – a condition that causes progressive scarring of the lungs making it more difficult to breathe.
Almost half of patients living with the condition will not survive for more than three years after diagnosis.
Katie was escorted off Loose Women in tears back in December as she spoke of her mum’s diagnosis after Keith Chegwin died of the same disease.
Last month, she attempted to run the London marathon in aid of the British Lung Foundation but was forced to pull out of the race after suffering a knee injury.
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