"Arianators" headed to Justin Bieber's upcoming world tours are in luck because Ariana Grande is set to be the opening act of the Canadian crooner. This had long been a rumour but has been cleared up all thanks to a tweet by the "Sam & Cat" star. So when will Ariana Grande open for Justin Bieber?

The Nickelodeon star, Ariana Grande is certainly making her way up to the top. Apart from starring in her own television series, "Sam & Cat", Ariana is busy working on her upcoming album. Believe it or not, this 5 foot flat actress has an impressive set of vocal chords. "X-Factor's" Demi Lovato was one of the Hollywood stars first impressed by the redhead singer.

"She has vocals that are just unbelievable, and I have so much respect for her because she is a true singer. She's someone that I feel like is going to have a long career because of her voice, and I think she's going to be a huge name. She's gonna be great," stated Lovato.

Even Justin Bieber's manager, Scooter Braun, was mesmerized with Ariana's voice which would clearly explain why she's the opening act for Justin Bieber's concerts.

"She reminds me of both Mariah [Carey] and Christina [Aguilera]. Christina was this young, petite girl with this gigantic voice and Ariana kind of has the same thing," says Braun in an interview with MTV, adding, "And her tone and her range remind me of Mariah."

"The thing about Ariana is she has that charisma and star [power]. The one thing about her, if you don't know, is she can really dance. And she hasn't shown that side yet. [She] really blew me away in rehearsal one time. But the thing that's exciting is the voice and what she can do with it. With a voice like that you can have a very long career because you can always sing," continued Scooter.

Fans of Ariana Grande better mark those calendars then because Ariana is set to take the stage with Justin Bieber. In a tweet to a fan, Grande confirms her schedule and her excitement about the tour.

"Yeah I think I'm doing the final 3 dates of the tour, I can't wait. So exciting!" stated Grande.

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