The former glamour model turns 36 next week and was supposed to be enjoying her special day with a tasteful sounding “pink and bling” themed party, organised by Kieran and her best friend Jane Pountney - who confirmed last week that they’d been having an “affair” behind Katie’s back.
A source told The Sun: “It’s so awkward. Kieran and Jane had planned everything for the day so Katie could relax.
“It was based on two of her favourite things, the colour pink and bling.”
It’s also been reported that another reason Katie, who is six months pregnant with Kieran’s child, isn’t in the party mood is because she’s beginning to feel old.
“She’s more aware of getting closer to 40 and becoming a mum of five. Katie feels she’s losing her youth.”
If you ask us she should show up to that party in her biggest, blingiest pink dress and have a good old knees-up with her friends and kids - we'd say she's more than earned a good time after the two weeks she's had.
After finding out that her husband had been unfaithful with her close pal of almost 20 years, Katie took to her Twitter page last week to announce that she was divorcing the builder and part-time stripper in a tirade of angry tweets.
The news of Kieran's infidelity came as even more of a blow to the star as just days earlier she'd confirmed that she was pregnant with the couple's second child, her fifth overall.
Earlier this week, she revealed in Now magazine that the split was “too raw” for her to talk about for the time being.