Justin Bieber made a sick fan's dream come true after taking time out to visit her.
The Canadian star later posted a photo of the pair hugging online on his Instagram, with the caption: "Look at this bundle of joy. I love her."
Millie's mother Amanda told the Deseret News: "We were able to do a really intimate little meeting with just her and us and Justin and it was incredible and he was so sweet to her.
"He walked in and her whole face just lit up, and she turned around and hugged her dad, and then he ran over and came next to her and gave her a big hug."
Justin, who is preparing for the release of his acoustic album, sang his hit Baby to Millie, while holding her hand. He also gave her his guitar pick.
"She is squeezing on to it with all her might and will not let it go," Amanda added.