Justin Bieber Pays Tribute to Mrs. Bieber, Avalanna Routh, in Concert

By:OK! Staff

Oct. 1 2012, Published 1:44 p.m. ET

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Merely a few days after Avalanna Routh's death, Justin Bieber paid tribute to his fallen little star.

Although the "Believe" tour kicked off on Saturday, the Biebs made sure to give a shout out to his six year-old fan he affectionately nicknamed "Mrs. Bieber."

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After losing her battle with a rare form of cancer, he 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."

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Well, according to GossipCop, Justin dedicated "One Less Lonely Girl" to his late pal and as he sang, photos of her were splashed onto giant screens. Even though he was sick and actually vomited during the concert, the show went on without a hitch!

After performing, the Biebs simply Tweeted, “Goodnight Avalanna. Tonight was for u. I love u.” Awww.