The former glamour model was spending a rare weekend with kids Junior and Princess – who have been living with Peter since last summer.
The kids moved in with their dad, his wife Emily MacDonagh and their half-siblings Amelia and Theo after Peter raised concerns about Katie’s chaotic lifestyle and drug use.
The pair had called a truce to allow Katie custody for the weekend, but it appears that she has spent the time firing sly digs at her ex.
Despite banning Peter from sharing pictures of 13-year-old Junior and Princess, 11, Katie didn’t hesitate to plaster her kids all over social media.
It comes amid a row which started after Peter denied allowing the kids to be a part of Katie’s new reality TV series, as the Mirror reports.
Katie took Princess, Junior and her eldest son Harvey to The Mexe Bexleyheath in south-east London last night, filming as they ordered food and tucked in.
Panning her phone over both Princess and Junior, Katie then turned to Harvey and asked, “Harv, are you enjoying your food?”
“Oh yes!” he beamed.
Katie also shared a picture of Princess doing her homework, and a video of her rubbing honey-flavoured lip balm on Katie’s lips.
“How cute, look what Princess has bought me,” Katie told her followers.
Princess, wearing a bright orange sweatshirt with her long curly blonde hair worn up in a ponytail, explained: “It’s Lush – you’re meant to eat it. Well, you’re not meant to eat it but I do.”
“Mmm, so nice,” Katie told her.
The family weekend comes after Katie blasted the kids’ dad for being a hypocrite after he banned Junior and Princess from taking part in the filming of her upcoming reality series My Crazy Life.
“I’m actually really cheesed off with Pete at the moment because when people are watching my show they’re going to think where’s Junior and Princess?” Katie raged to Piers Morgan on Good Morning Britain earlier this month.
“He won’t allow me to film with them, he won’t allow me to do photo shoots with them, he’s being such a hypocrite.”
She added: “Unfortunately these days you need both parents permission, so I just want to put it out there that he’s really selfish and the kids miss out on it. I don’t know why he’s doing it.”
Insiders said Katie had been stunned by Pete’s decision, and decided to get her own back.
“Pete thinks Katie has lost the plot and was trying to make him look bad by calling him out on live TV. But it doesn’t faze him any more,” one told Now magazine shortly after the GMB incident.
“He had previously agreed with her that she wouldn’t film the kids for her show because he was concerned that there was too much focus on their mum going to rehab… But Kate went ballistic. The producers will want the kids involved because they are really popular with viewers.
“Kate said that he could no longer point pictures of Princess and Junior on social media pages. Pete agreed, which Kate didn’t see coming,” they added.
Sure enough, Peter hasn’t shared any snaps of the kids since November 2018.