If the Disney movie "Frozen" has taught us anything, it's that some things are worth melting for. And Kristen Bell's voicemail to a 6-year-old battling cancer is melting the hearts of thousands.

On July 24, Brandon Huffman uploaded a YouTube video of his daughter Avery listening to a voice message from Bell -- or Princess Anna -- as Avery believes. The video has been viewed more than 1 million times. 

"I just wanted to call and say hello, so hello!" Bell says. She even mentions one of Avery's toys. "I hope you're having a great day and playing a lot with Hoppy Jumpy."

Like most little girls, Avery loves "Frozen," so much that she's still listening to the soundtrack and watching the film in the middle of July, Huffman writes on a blog where he details Avery's battle with diffuse intrinsic pontine glioma, or DIPG.

Avery was diagnosed with a brain tumor on June 30. According to St. Jude Children's Hospital, DIPG is a type of tumor that "starts in the brain stem, the part of the brain just above the back of the neck and connected to the spine." It is most common in children between the ages of 5 and 10.

Since her diagnosis, Huffman has also been sharing her story on social media with the hashtag #AveryStrong.

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To help Avery feel extra-special, Bell ended her call by telling her that Elsa has helped decide to deem the 6-year-old an honorary princess of Arendelle.  

Avery's father admits he's watched the video around 50 times just to see her smile.  

"Seeing it go viral and so many people sharing the same emotions I have when I watch it, I'm constantly reminded that while Avery is going through the worst possible fight anyone should have to, she's touching so many people's hearts and her fight and toughness is reaching so many people," he wrote.