Holly set up the magical photoshoot, featuring 11-year-old Harry, nine-year-old Belle and six-year-old Chester, in her garden and shared the result on her Instagram Story over the weekend.
The picture sees Harry dressed as Harry Potter, Belle as Hermione Granger and Chester as Ron Weasley, with each of the children lying down on the grass and covering their faces with a hat.
They all hold broomsticks, with Belle also clutching a toy cat to complete the witch's ensemble.
The scene is completed by sheets which have been arranged into the shapes of clouds and the moon, giving the impression that the trio have flown up into the sky. Music from the Potter movies played over the photo to set the mood even more.
Holly confirmed she took the snap herself and said it was an advert for the new Harry Potter range at Marks & Spencer, a brand which Holly is an ambassador for.
Holly rarely shares photos of her children, who she shares with husband of 13 years Dan Baldwin, but she did recently mark son Chester's sixth birthday with a sweet Instagram post.
Holly joked that Chester's impressive Chelsea Football Club-themed birthday cake had upset Dan, who is an Arsenal supporter.
"That's our boy all over," Holly said. "Marching to the beat of his own drum, spreading absolute joy wherever he goes".
This Morning airs weekdays at 10am on ITV.
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