Kristen Bell Leaves Touching Voicemail For Girl With Brain Cancer As Anna From 'Frozen'

"Only an act of true love can melt a frozen heart."

That's what you may have learned from Disney's 2013 smash hit "Frozen", and one of its cast members is living that lesson as seen in a video posted to YouTube Friday. It's sure to warm your cockles.

Kristen Bell caught wind of Avery and how she, like most 6-year-old girls, loves "Frozen". Avery has an inoperable brain tumor and her parents have been capturing her story online -- sharing it with the world on the hashtag #AveryStrong.

The Veronica Mars actress and Michigan native recorded a voicemail for Avery in character as princess Anna of Arendelle.

Related: Kristen Bell Sings All The Voices Of 'Do You Want To Build A Snowman' Live

Avery's face lights as she recognizes a voice from one of her favorite movies. In Bell's heartfelt and personal message she mentions Avery's rabbit Hoppy Jumpy and passes a greeting along to her brothers and sisters.

In the magical one minute video Bell consults with Queen Elsa and makes Avery an honorary princess for being "so brave," and a "good girl.

To learn more about Avery's diagnosis, follow her journey and make a donation to the cause visit caringbridge.org.

As the video wraps up, Avery nods as Bell adds, "I think you'll make a great princess."

No doubt.