The Strictly Come Dancing finalist posted a snap from the bash which saw her doting on her little girl while surrounded by pink and rose-gold balloons.
Captioning the photo, she penned: “One year of you. Here’s to the houses that are never quiet or tidy.”
The presenter, 39, later took to her Instagram Story to share a photo of kids in party costumes and enjoying birthday cake at the party, which was attended by family and friends.
Writing across one of the images, Skelton shared: “A wolf in a tantrum. Spidergirl needing balloons and lost cricket gloves.
“All the chaos, All the love baby girl.”
The newly-single star shares Ernie, seven, Louis, five, and Elsie with ex Richie Myler.
The BBC star and Myler, 32, married in 2013 and separated this April – four months after she gave birth to their third child.
Following the pair’s split earlier this year, they continued to live together for months after their marriage broke down, but avoided each other.
In an unearthed interview from before they officially split, when Skelton was asked if their staying under the same roof reignited any romantic feelings, she replied: “No... We’re not in the house together – we are staying out of each other’s way.
“We say this is the dream as we have breakfast, lunch and dinner together but then look after the kids in shifts.
“You appreciate the other in this situation. I don’t think he’ll ever say again: ‘What do you do with the kids all day?’”
“Sometimes I would get in from work and he’d be that husband that would look at the kitchen and say: ‘How is this still a mess when she’s been off all day?’” she added to The Mirror. “Now he’s done it he’s like: ‘How does she stay sane?’”
Skelton and her three children have since moved back in with her parents in Cumbria.
The TV star is currently single while Myler swiftly moved on with new girlfriend Stephanie Thirkill, also 32, with the new romance coming to light in May, days after it was announced that his eight-year marriage to Skelton was over.
Thirkill’s father, Andrew Thirkill, is the multimillionaire president of Myler’s rugby league club, Leeds Rhinos.
It was revealed recently that Myler is expecting a baby with his new girlfriend.