The two children have been living with their dad full-time as the former glamour model deals with personal and financial problems.
Writing in his Planet Pete column for new magazine, the singer revealed he'll be taking all four of his children trick or treating – with youngest son Theo, who is almost two, finally old enough to enjoy the occasion.
Pete wrote: "I'm so ready for Halloween!
"I've got my skeleton onesie and I'm ready to wear it! At the time of writing my column, the rest of the family haven't decided what they're dressing up as, but I am sorted so that's all that matters, right?
"Theo was a little too young to properly enjoy Halloween last year, so we can't wait to take him trick or treating with us.
"Let me tell ya, he's definitely not too young to enjoy chocolate!"
Peter has Theo and four-year-old Amelia with his wife, Emily MacDonagh.
The TV favourite split from 11-year-old Princess and 13-year-old Junior's mum Katie in 2009 after three-and-a-half years of marriage.
Peter gained full custody of their children in June of this year – with Katie facing potential bankruptcy over a £22,000 unpaid tax bill.
Katie appeared in court today after being given six weeks to come up with a repay plan, known as an Individual Voluntary Arrangement (IVA).
She submitted a last gasp proposal to rescue her finances and the hearing has now been pushed back to December 4.
The Mirror has reported that this decision may leave the mother-of-five homeless – potentially forcing her into council housing.
Although an official figure for Katie's currents debts is yet to be announced it has been reported that the total amount could be as high as £600,000.
Meanwhile, Peter gushed about how "lucky" he is in an exclusive chat with The Sun Online at last night's Pride Of Britain Awards.
Speaking about his 29-year-old wife, Emily, and adapting to life with four children under the same roof, Pete shared: "We're a good team, she's really good, she's always smiling, I'm always smiling.
"We're so lucky, I feel so lucky and I find ways to juggle it because you get used to what you do and you take time out to be with your family."
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