Youngsters at the Wiltshire school each penned an individual letter to the Duke and Duchess of Cambridge asking if their son Prince George could be enrolled at the school after falling numbers threatened to see it close.
The children decided that having Britain's future King join their classes would help persuade the local authority not to close the school.
Two months later, teachers and students alike were shocked and excited when William and Kate's staff sent personalised responses to the pupils' pleas.
Enclosed in the special envelopes the royal couple also included their favourite photo of themselves with George, taken on the steps of the Lindo Wing at St Mary's Hospital the day after his birth.
"After returning from our half term break we were delighted to discover that we had received a response from Kensington Palace following writing to the Duke and Duchess of Cambridge before Christmas," read a statement on the school's website. "Upon opening the package we were surprised to see that each of us had received a personal letter from the House of William and Kate!"
"We were over the moon getting these letters back," added head teacher Amy Bekker Wrench. "They just landed on my desk."
In her letter one little girl called Keeleigh was told that "Their Royal Highnesses were impressed by your persuasive comments; you certainly made a wonderful case for Chirton Primary with its beautiful large grounds being the ideal school for Prince George."
In recent weeks Chirton Church of England Primary School has reported an increase in admissions and is no longer facing closure.