The photograph of Princess Anna von Hohenzollern in full Frozen costume for a letter to Kapiti kindergerten kids.

A German princess has donned a Frozen-style gown, plaited her hair and created a story of noble drama to help Kapiti Coast preschoolers believe in magic.

Princess Anna von Hohenzollern, who lives in a 14th century castle - with moat - beside the Rhine, went the extra yard for the children of Grafton Private Kindergarten in Paraparaumu after they struck up a globe-spanning friendship.

Kindergarten teacher Denise Harrison said she met the princess during an OE to Europe, which included a trip to the Hohenzollern castle.

Joel Maxwell Grafton Private Kindergarten students, from left, Stacey Dunn, Jack Robbie, Max Wood, Danika Stratford, Nikau Dunn, and Frankie Watterson-McArthur with teacher Denise Harrison.

Harrison realised the German noble had similarities to her animated namesake in the movie Frozen.

"I said 'Princess Anna, the children love you because of the movie Frozen ... would you mind if we wrote to you?' and she said, 'oh, but of course'."

The children at the kindergarten north of Wellington sent a class photo, with three burning questions: "Do you have a crown, do you have a horse, and do you have long dresses?"

DISNEY Prince Hans and Princess Anna from the movie Frozen.

Princess Anna's reply included photos of herself in a Frozen Princess Anna gown, with plaited hair, looking into a lake near the castle where she said she lost her crown.

The children were so worried they made replacements and posted them to castle Hohenzollern.

Contact with an actual Princess Anna left students like Danika Stratford, 4, besotted. She was a Frozen fan and came to kindergarten wearing a crown on Friday.

She said she also wore Frozen gumboots, and revealed she could be a princess herself. "That's what mummy calls me every day."

After Princess Anna's crown care-package arrived she got back into character and sent a panel of photos, wearing each of the crowns. She also posed with a suit of armour in the castle that impressed the boys.

Now the kids want to help Princess Anna celebrate her birthday in a fortnight.

Harrison said she had emailed the princess and checked she was not overwhelmed with the attention.

"She said 'no, it makes me very happy'."

The birthday plans are underway, and for the time being Princess Anna will keep the magic alive for the Paraparaumu pre-schoolers.

"It's kind of like the Father Christmas thing: it's not real, but it's real," Harrison said.