Parents of ‘Mrs. Bieber,’ Avalanna Routh, Say They’re ‘Touched’ By Justin Bieber’s Concert Tribute (EXCLUSIVE)

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The parents of Avalanna Routh — the six-year-old Justin Bieber superfan who lost her battle with a rare form of brain cancer last week — have thanked the pop star for his emotional tribute to their daughter.

Bieber, 18, displayed a touching photo montage of “Mrs. Bieber” during his song “One Less Lonely Girl” at his Glendale, Ariz. concert on Sept. 29.

“We didn’t know he’d be dedicating the song to her. It was completely unrehearsed,” Avalanna’s father, Cameron Routh, told Celebuzz in an exclusive interview.

“We were so touched by it. But I wasn’t really surprised, because that’s just the kind of guy he is.”

During the time that Avalanna was fighting her brain cancer, the “Baby” singer helped the youngster’s dreams come true when he flew her and her parents to New York to meet him.

At the time, Bieber told his followers on Twitter that he was hanging out with “a special little girl, #MrsBieber.”

She was dubbed “Mrs. Bieber” after nurses at a Boston hospital threw a pretend wedding.

Of the tribute, Cameron said: “Avalanna would have loved it. She loved parties, loved people and loved adventures. She would have taken the phone from me and told you herself.”

Avalanna had suffered from ATRT, or atypical teratoid rhabdoid tumor, for half of her life until she lost her battle with the disease on Sept. 26.

Cameron said his family has been overwhelmed with the global support for their late daughter.

“What happened overnight was impressive, that’s all I can say. It’s not just Justin, it’s everyone that has shown their outpouring of support from all over the world,” he added.

“Justin is a great guy and everything you’ve seen is genuine the whole time. He’s just terrific. We think so highly of him. He’s such an impressive young man and we’re honored to know him.”

Cameron said his wish to keep Avalanna’s memory alive.

“Our goal for her is continuing her legacy to put an end to ATRT,” he said.

“I’m sure Justin will be part of that. I think we’ll have a friendship forever.”