Kristen Bell called a little girl with brain cancer as Anna from 'Frozen,' and her dad taped it all.

It was such a warmhearted thing to do.

A 6-year-old girl who is bravely fighting an incurable type of brain cancer just got a heartwarming pep talk ... from Frozen's Princess Anna of Arendelle.

It came in the form of a voice message on her dad's cell phone. But unlike most kids who get a "message from Anna," it wasn't a prerecorded tape or her mom doing a voice.

Photo by Amy/Flickr.

It was Anna's voice actress Kristen Bell, herself.

Photo by Michael Buckner/Getty Images.

According...

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