"At some point tonight Tom Cruise's agent will have to call Tom Cruise and tell him Justin Bieber has challenged him to a fight", another user tweeted. "Tom if you don't take this fight your scared and you will never live it down", tweeted the singer.
Bieber's tweet quickly went viral, prompting UFC champion Conor McGregor to chime in with an offer to host the fight.
Suddenly it's the late '90s and we're watching 'Celebrity Deathmatch' on MTV again except this time Justin Bieber is legit calling out Tom Cruise in real life and we're not even sure what's real any more.
"If Tom Cruise is man enough to accept this challenge, McGregor Sports and Entertainment will host the bout", he wrote on Twitter.
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Conor McGregor has expressed an interest in getting involved, while UFC fighter Cris Cyborg seems prepared to take the Biebs on if Cruise doesn't. Stay tuned to find out whether this is just some sort of PR move for upcoming music from Bieber or if The Biebs actually has beef with Cruise.
He also jumped on the actor-hating bandwagon, challenging The Departed star Mark Wahlberg.
Back when mark wahlberg was marky mark, I'd've still slapped the ears off him and took my ufc shares back.
As the confused people of Twitter await some clarity, they're turning to jokes for comfort. "Stop the world, I'm getting off", said another.
Justin Bieber (0-0) is one of the most popular musical artists on the planet. Either way, Cruise has yet to publicly respond to the challenge.