Avalanna Routh, the little girl who called herself “Mrs. Bieber,” passed away on Wednesday from a rare form of brain cancer. Her last wish was granted – having a pretend wedding to Justin Bieber who has said it is the best thing he’s done.

WATCH: Avalanna meets Justin Bieber

Her family made the sad announcement on her Twitter account today: “Our darling Avalanna went to Heaven this morning. Oh Avalanna, the brightest star – you took our hearts with you, our greatest Love;( “

After hearing of her death, Justin Tweeted: “Just got the worst news ever. One of the greatest spirits I have ever known is gone. Please pray for her family and for her. RIP Avalanna. I love you.”

Avalanna met The Biebs after a social media campaign led to the surprise meeting in New York.