Here's a celebrity fight nobody saw coming.

For reasons only known to Justin Bieber, the Canadian terror jumped on Twitter last night and challenged  Tom Cruise to get in the octagon.

I wanna challenge Tom Cruise to fight in the octagon. Tom if you dont take this fight your scared and you will never live it down. Who is willing to put on the fight? @danawhite ?

— Justin Bieber (@justinbieber) June 10, 2019

I wanna challenge Tom Cruise to fight in the octagon. Tom if you dont take this fight your scared and you will never live it down. Who is willing to put on the fight? @danawhite," Bieb's typed.

If Tom Cruise is man enough to accept this challenge,
McGregor Sports and Entertainment will host the bout.
Does Cruise have the sprouts to fight, like he does in the movies?
Stay tuned to find out! https://t.co/TxsH9KUyFg

— Conor McGregor (@TheNotoriousMMA) June 10, 2019

The early odds favor Bieber 2 to 1. He is 31 years younger and a couple of inches taller.

But Cruise has that crazy Scientology energy, decades of action hero preparation, and we assume a lot of HGH. We might have to put some money down on Ethan Hunt.