"I wanna challenge Tom Cruise to fight in the octagon," JB randomly tweeted on Sunday night. "Tom if you dont take this fight your scared and you will never live it down."
He then decided to tag UFC head man Dana White to see if we wanted to promote the fight, writing, "Who is willing to put on the fight? @danawhite ?"
While the idea of JB and Tom throwing down might seem like a good time, sources close to Bieber tell us Justin doesn't actually want to fight Ethan Hunt himself ... he was just having a little fun on social media.
If they do decide to ever square off, we have a suggestion for a venue ...