Fans are left wondering why Justin Bieber has unfollowed his longtime mentor and close friend Usher on Instagram, with some speculating it could be due to a "big" reason.

Discover the fallout between Justin Bieber and Usher on Instagram. Learn about the rumors and allegations surrounding their mentorship.

Justin and Hailey Bieber aren't holding back how they feel! On Tuesday, January 14, the singer uploaded a batch of new photos from their vacation to snowy Aspen, Colo., and while most of the snaps featured the dad-of-one taking in the scenery,

Justin Bieber has unfollowed Usher on Instagram. The action has sparked much speculation and questions from fans who are wondering why the singer would unfollow his longtime mentor and close friend. Justin and Usher have known each other since 2008 when the Canadian pop star was 14 year-old and Usher signed him to his joint record label with Scooter Braun.

Justin Bieber unfollowed his longtime mentor Usher on Instagram. Here's what you need to know about the ongoing situation.

Justin Bieber has unfollowed R&B star Usher on Instagram, despite Usher - who recently detailed a P Diddy party he attended at 13 years old - previously being described as a 'mentor' and 'close friend of the Canadian,