Kristen Bell Leaves 'Frozen' Voicemail for Young Fan With a Brain Tumor: Watch

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Kristen Bell attends the premiere of Walt Disney Animation Studios' 'Frozen'at the El Capitan Theatre on Nov. 19, 2013 in Hollywood, California.

The Frozen Kingdom has a new princess! Kristen Bell left a dream-come-true voicemail for 6-year-old Avery Huffman, who was diagnosed with diffuse intrinsic pontine glioma (DIPG), an inoperable brain tumor, last month.

In the message, Bell got into character as Anna, Frozen's Princess of Arandale, and told the little girl that her sister, Queen Elsa, wanted to make Avery an honorary princess for being such a "good girl and being so brave." Bell signed off by saying that she had to "go build a snowman with Olaf."

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Watch the full, adorable video below posted Friday by Audrey's dad. You can keep up with Audrey's journey on Twitter with the hashtag #AveryStrong.