Katie landed back in the UK in the early hours of the morning, but still hadn't made contact with her kids before they went in for the first day of their new school.
"Peter is upset," an insider told The Sun Online. "It's devastating for him, he's upset for the kids that it has to be this way."
"He wanted everything to be perfect on their first day. He's let down for them.
"He's just sad for them that they didn't get a call from their mum on the big day."
Junior has recently won a prestigious drama scholarship to the private school, and Princess, who is three years younger, just got a distinction in her LAMDA exams.
Katie was pictured looking tired after a night flight back to the UK from Spain, where she's been partying with new boyfriend Alex Adderson.
The Sun Online revealed that she told friends that she "lost her phone" while on holiday and that's why she couldn't contact her children before their first days at school this week.
Soon to be ex husband Kieran Hayler revealed he'd sent daughter Bunny off for 'big school' without a word from her mum.
The Sun Online revealed that he'd tried to Facetime Katie three times without an answer.
And today, proud dad Pete shared an adorable video of the children he shares with Katie on their way to a new school too.
In the clip Junior, 13, and Princess, 11, were in the back of the car – with their seat belts on – as Peter recorded a teary video.
He said: "Right, here we go! First day of high school, I cannot believe it!
"Oh my gosh! First days, guys! Junior starts his drama scholarship!
"Both of them are going to secondary school today for the first time!"
He also posted a picture of Junior and Princess posing in their school uniforms outside their front door.
He captioned the snap: "And here they go. Very first day at High School.
"They said if I get emotional they’re gonna tell everyone I’m not their dad.
"I’m like ‘I can’t help the pollen count’. Good luck kids!"
Katie missed daughter Bunny’s first day of school so she could continue her boozy getaway in Spain – just days after her split with younger boyfriend Kris Boyson.
She instead left ex-husband Kieran Hayler with the job of getting Bunny and her older brother Jett, 5, ready for school.
Over the weekend, the mum-of-five was pictured groping her new beau, who went public with their romance on Sunday.
The Sun revealed how under-fire Katie met wealthy model Alex — who is pals with Towie’s Sam Mucklow and Jake Hall — weeks before she split from Kris, after they were introduced by mutual friends.
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