She posted a photo of herself holding hands with one of her children - assumed to be two-year-old Chester - in bed with her as she woke up.
“I know it’s too hot to sleep,” she wrote on Wednesday 21 June. “But when you wake up next to this... 😍😍😍.”
Fans who are also mums commented on the photo calling it a “priceless” moment.
A fan commented on the photo: “Best feeling in the world! I have one of these who insists on holding hands.”
Another wrote: “Exactly the same set-up as me this morning, I’ll defo miss it when my youngest doesn’t want to get in with me.”
And another commented: “I’ve been having the same. Little hot sticky snuggles! And my big little girl wanted to get in bed too - worth it despite the heat.”
Others joked that her husband Dan “had a small hand”.
One wrote: “Ooh Dan’s hands have shrunk, or did you kick him out the bed? Haha.”
Willoughby is also mum to seven-year-old Harry and six-year-old Belle with her husband Dan Watkins.