Kristen Bell Leaves Voicemail as 'Frozen' Princess for Girl With Brain Tumor Bell crowned the 6-year-old "as a honorary princess of Arendelle."

 -- Kristen Bell just made one very brave girl's day.

Avery Huffman, 6, recently was diagnosed with an inoperable brain tumor and her family has been documenting her battle on caringbridge.org.

"On June 30th, our sweet Avery was diagnosed with a brain tumor, a cancerous tumor that is inoperable ... a brain tumor found in the pons, part of the brainstem on the lower back of the brain, near the top of the spinal cord. Please join us in prayer as we stand with Avery as this tough little girl fights the battle of her life. #AveryStrong," her family wrote on the site.

Well, someone must have gotten the message to Bell, because she took it upon herself to call Avery and leave her a sweet message as Anna from "Frozen." ABC News confirmed that it was Bell who sent the voicemail.

In the voicemail, she says, "This is Princess Anna of Arendelle. I just wanted to call and say, 'Hello.'"

She then brings her a message from her sister Elsa, who had heard "you've been such a good girl."

"She has decided to crown you as a honorary princess of Arendelle," Bell adds. "I think you’ll make a great princess."

It made quite an impression on Avery and her family.

"I've watched the video of her hearing from Anna/Kristen Bell, around 50 times, just to watch her face light up, and to hear her giggle and see her smile," Avery's parents, Brandon and Amanda, commented on the Caring Bridge site.

"Frozen" was released by Disney, parent company of ABC News.