We doubt this is an April Fools' Day joke ... Justin Bieber just announced he's indefinitely postponing his Changes tour due to Covid-19.

The singer expressed regret in this Tweet, signaling that the organization and logistics required to continue moving forward with the proposed performance dates, which were to start in May 14 in Seattle -- one of the cities hardest-hit by Coronavirus. The 45-date stadium/arena tour would have been Biebs' first tour in three years. He had announced the big news Christmas Eve.

Meanwhile, he and wife Hailey Baldwin have been quarantining in their isolated Canada home to stay extra safe during the spread of this dangerous virus, particularly since Justin is immuno-compromised due to his Lyme disease.

He and Hailey have been having fun with the social-distancing, however -- check out their "floor is lava" shenanigans!

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