Gabriella Miller and her mother, Ellyn Miller. Campaign organizer Christina Croll said Gabriella's tumor makes it difficult for her to smile -- "but she still lights up the room." (Courtesy of Miller family)

In December, we first heard the story of Gabriella Miller, a fourth-grader at Loudoun Country Day School in Leesburg who had been diagnosed with inoperable brain cancer. Gabriella applied for a trip to Paris from the Make-A-Wish Foundation, but wanted to help other kids too.

So in hopes of raising money for the foundation, she and her parents, Ellyn and Mark Miller, launched a campaign to write 10,000 letters to Santa Claus for Christmas. Macy’s had pledged to donate $1 million to Make-A-Wish if they received one million Santa letters.

Gabriella quickly topped 10,000, and then set a new goal of 50,000. Now, The Post’s Caitlin Gibson reports the results: Almost 241,000 letters came in from around the world, inspired by Gabriella. That raised enough money to send 36 children on Make-A-Wish trips.

Gabriella, who turned 10 in January, is also making big progress in her fight against cancer. On Wednesday, her family reported on their Facebook page that Gabriella’s tumor had shrunk at least 50 percent, which was unexpected so soon after radiation treatments.

Read the rest of Gibson’s story here. Check the website of Christina Croll, who helped organize the letter-writing campaign, here. And get updates on Gabriella from her family here. I dare you not to cry.