Kristen Bell leaves sweet voicemail as Frozen's 'Anna' for young fan with brain tumor

HIDDEN HILLS, Calif. -- The "Princess of Arendelle" recently took time to make a young girl's day -- and also let her know she is now an "honorary princess."

Kristen Bell and her very close friend "Princess Anna" from Disney's Frozen left an adorable voicemail for Avery Huffman, a 6-year-old girl who was diagnosed last month with an inoperable brain tumor.

Avery's parents have been sharing her story on Twitter with the hashtag #AveryStrong and on her CaringBridge page.

"Anna" congratulated Avery on being a "good girl" and so brave. She said "Queen Elsa" would love to make her an honorary princess. She ended the call by saying she was going to play with "Olaf" and saying, “I think you’ll make a great princess."

More on Avery Huffman: CaringBridge | GoFundMe | Talbert Foundation