According to a source, the mother-of-five threw a party on the launch night, but spent most of the night 'reminiscing over Pete'.
The insider told Reveal:
"Katie threw a huge party for the launch night but, with Pete's face popping up every couple of minutes, Kieran wasn't happy.
"When it finished, she spent the rest of the evening talking about what a fantastic experience it was [being on I'm a Celebrity] and how she'd do it all again - it was 'me and Pete this' all night. Kieran just had to sit there stewing in silence.
"Eventually, he walked out of the room and went to chat to the household staff in the kitchen."
READ: PETER ANDRE FORCED TO MAKE GROVELLING APOLOGY AFTER ICELAND JOKE
Katie and Kieran have had a tough year, with the 36-year-old model outing her new husband's affair with former best friend Jane Pountney on Twitter earlier this year.
The pair are parents to toddler Jett and baby Bunny, as well as Katie's children Junior, 9, and 7-year-old Princess from her marriage to Pete, and 12-year-old Harvey from her relationship with Dwight Yorke.