The author and businesswoman, 35, claims she has not seen her two children Junior and Princess Tiaamii for over a week while they've been with their dad Pete.
In an angry tweet yesterday (22 February), Katie wrote: "disgusting,haven't heard from my children for 11 days no tex no missed calls no messages and people wonder why I don't have good word to say."
When fans responded to console her while others tried to defend Peter, Katie went on to say that she had also tried ringing but had received no answer.
Peter, who recently became a dad for the third time, has not responded to Katie's attack.
A rep for Peter had no comment when contacted by Reveal.
His fiancée Emily MacDonagh gave birth to their daughter Amelia in January.
Katie and Pete were married from September 2005 until they announced they were separating in May 2009 after three and a half years together. They had two children together, Junior, now eight, and Princess Tiaamii, six.
disgusting,haven't heard from my children for 11 days no tex no missed calls no messages and people wonder why I don't have good word to say— Katie Price (@MissKatiePrice) February 22, 2014
Katie also has two other children, Harvey, 11, from her relationship with footballer Dwight Yorke, and fourth child Jett who was born in August 2013 after her marriage to Kieran Hayler.
Later the same day, Katie took to Twitter for a more light-hearted message to her friends and fans.
Posting a picture of her eldest son Harvey with youngest son Jett, Katie wrote: "So cute Harvey was rocking Jett and got him to sleep while we put food shopping away."
This weekend, she was left upset when thieves broke into her car and stole her Louis Vuitton handbag and other valuable from her parked car in Horsham.
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