Justin Bieber is reportedly planning on another massive worldwide concert tour following the release of his new album on Nov. 13. It's believed the "What Do You Mean" singer has invited Ariana Grande to perform with him on several shows.

Details to Justin's reported album tour is still scarce. However, a source revealed that he will probably be singing with Ariana when he ends his show in the United States. The insider told New York Daily News' Confidenti@l exclusively that Justin and Ariana will be sharing the stage to promote their music, with Arian singing her songs and Justin's his. But they have yet to plan on which song they are going to do a duet on.

"The whole thing will hopefully end in several (U.S.) stadium dates with special guest Ariana Grande. This is in the very early stages but serious conversations are taking place," the source said.

Since it would be Justin's tour, then he is expected to open the show. The source claimed he and Ariana may eventually decide on what song they can perform together or sing solo. Then they'd "likely unite at the end of the show for a hit," the source told Confident@l.

Although no final decisions have been made yet, it's believed both parties want to make the tour happen. The source further told Confidenti@l that Justin and Ariana plan to "team up together for several duets." Justin's worldwide tour is expected to draw in millions of fans especially with Ariana as his guest.

"There is a ton of crossover in their fan base. If it does happen, it will be the top tour of 2016, pulling in hundreds of millions for the two singers," another source told Confidenti@l.

The last time Ariana Grande and Justin Bieber performed together on stage was in April during Ariana's "Honeymoon Tour." She had asked Justin to be her guest at her Los Angeles show, where they did a duet on her song "Love Me Harder." They also sang one of Justin's top hits "As Long As You Love Me."

It would be understandable to see Justin bring in Ariana as his guest during his reported massive worldwide tour. According to Hollywood Life, Bieber and Grande both are under music manager Scooter Braun.

Justin Bieber was recently in Australia promoting his new song "What Do You Mean." The Canadian was even asked to stop by "The X-Factor Australia" studio to perform the track. His performance of the single, which comes from his new album, was revealed on last week's episode of "The X-Factor Australia."