The 34-year-old, who already has sons Harvey, 10, and Junior, seven, as well as daughter Princess Tiaamii, five, from her previous relationships, is expecting her first child with third husband Hayler, reports contactmusic.com.
Her friend Danielle Lloyd, who is expecting her third child with husband Jamie O'Hara, told Closer magazine: "Katie and I think we'll both have the same sex babies as we've felt exactly the same with our nausea."
"Katie knows what she's having, but she's keeping it quiet. I'm excited because I find out in two weeks. We weren't going to find out, but keep changing our minds - I want to be prepared," added Lloyd.