Over the years, there have been plenty of feuds between celebrities that have captured our attention.
You've got Mariah Carey vs Jennifer Lopez, Nicki Minaj vs Cardi B, Taylor Swift vs Katy Perry, Machine Gun Kelly vs Eminem, Tyrese Gibson vs The Rock...we could go on.
But it seems like we have our latest battle and it's between two very unlikely people.
Pop sensation Justin Bieber has challenged renowned Scientologist and action star Tom Cruise, of all people, to go toe to toe with in the octagon.
Writing on Twitter, the 'Sorry' singer said: "I wanna challenge Tom Cruise to fight in the octagon. Tom if you don't take this fight your scared and you will never live it down. Who is willing to put on the fight?"
There's no clear answer as to why he's singled out the Mission: Impossible star. They're both from very different religions so maybe it's a battle of the holy books?
The only thing we know is that everyone on the internet is dying for this to actually happen; mainly because they want Bieber to get decked by the Top Gun.
It wouldn't be an entirely fair fight considering Cruise is more than double Bieber's age but maybe he could use his wisdom to defeat the singer.
The big thing is that Conor McGregor is keen to see the match play out, writing on Twitter: "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!"
Why would you try to take on this guy? Credit: PA
McGregor famously challenged Mark Wahlberg to a fight in April.
The Notorious posted a series of tweets, which said: "I've decided to challenge Hollywood actress Mark Wahlberg next. A fight for all the shares!
"I'll smack him and his 4 brothers around.
"It wouldn't be the first crew of brothers I've smacked around. Check the history books. The UFC history books."
It was probably all classic McGregor smack talk as we highly, highly doubt that this fight will ever see the light of day.
It's unclear why McGregor focused on him but it might be because TMZ asked Wahlberg what he thought of the Irishman's request to become part owner of the UFC.
The Shooter star said: "Cut the cheque baby. He's got to cut the cheque. Everybody cuts a cheque if you want a piece."
Who knows, maybe we might see Bieber and Cruise go toe to toe.
Featured Image Credit: PA