Justin Bieber Dedicates Show to 'Mrs. Bieber' Avalanna Routh

Justin Bieber sings his heart out while performing at the MGM Grand Garden Arena during his Believe tour on Sunday (September 30) in Las Vegas.

“Did it BIG in Vegas 2nite with big bro @UsherRaymondIV,” the 18-year-old pop sensation wrote on his Twitter account. “Expect the Unexpected on the #BELIEVETOUR..next stop. LOS ANGELES!! 2 NIGHTS!”

Carly Rae Jepsen hit the stage before Justin as the opening act, which she will be for the entire tour.

The evening before, Justin dedicated his opening night show to “Mrs. Bieber” Avalanna Routh, one of his biggest fans who sadly passed away last week.

“Big day today. Tonight is for my angel. #mrsbieber,” Justin tweeted.

FYI: Carly Rae is wearing a custom pair of Shoes of Prey flatforms.

15+ pictures inside of Justin Bieber and Carly Rae Jepsen performing at the MGM Grand Garden Arena…