9 World Book Day costumes: best celebrity kids photos from Rochelle Humes, Coleen Rooney & more

Coleen Rooney's son looked delighted to dress as Harry Potter. As well as long Hogwarts robes and the character's trademark lightning scar on his forehead, he also carried a mini Dobby toy!

Instead of dressing as a fictional character, Frankie and Wayne Bridge's son chose his real-life superhero Jason Fox, also known as Foxy on SAS: Who Dares Wins. Tagging Foxy in the Instagram Stories photo, Frankie wrote: "Ready for action," as she proudly showed off her son's khaki military uniform, complete with a matching hat and backpack.

Louise Redknapp shared throwback photos of her two sons Charley, now 20, and Beau, now 16, on World Book Day. Years ago, her eldest son sprayed his hair grey and wore a white shirt and glasses from Demon Dentist, while Beau wore a vest with a crocodile hood for The Crocodile Who Didn't Like Water.

Peter Andre's wife Emily revealed Amelia and Theo's homemade outfits. Speaking about their "hectic" morning, she explained: "Millie designed her own outfit and went as Lottie Brooks (any parent of a tween girl probably knows all about these books - they are fab!) and Theo opted for an old classic." 

Rochelle Humes never halfheartedly marks the holiday, and this year was no exception. Her eldest daughter Alaia-Mai appeared to be dressed as Mary Poppins in a blue skirt suit, a top hat and an oversized shoulder bag as she stood next to her brother Blake, who pulled a superhero pose in his Spiderman onesie.

Merlin actress Georgia's three youngest children dressed in colourful outfits for the occasion, posing on the porch ahead of school. 

"Andy from the treehouse, Bella the Blueberry fairy & 'The Wall' from the Marvel comic super spidey stories: vol 1 issue 8 published February 1975. #worldbookday," she explained in her caption. Many noted The Wall was an unusual choice, with one praising the "utterly inspired" costume.

There was no mistaking Reggie's outfit! Josie Gibson shared a photo of her son in blue trousers, a white and red striped top, a matching hat and large round glasses as he held a Where's Wally Now? book.

Committing to the cause, Helen Skelton's daughter Elsie allowed her brother Ernie to complete her tiger look with face paint. The eight-year-old was captured drawing a nose on his younger sister, who sported an orange onesie and disheveled hair.

How cute was Jamie and Frida Redknapp's son Raphael? Grinning from ear-to-ear, the two-year-old embodied The Very Hungry Caterpillar in a soft green tracksuit with a striped sweater vest over the top and an orange hat with antennas.