The 25-year-old singer is looking for his first mixed martial arts fight against Hollywood star Tom Cruise.

Challenging Cruise via Twitter, Bieber wrote, "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?"

Conor McGregor piped up to reveal his sports and entertainment company would be willing to host the fight, "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!"

The Irish UFC fighter also went on to challenge his own desired opponent, Mark Wahlberg, "I challenge Mark Walhberg on the very same card. Back when mark wahlberg was marky mark, I’d’ve still slapped the ears off him and took my ufc shares back."

Tom Cruise and Mark Wahlberg are yet to reply to the requests from Justin Bieber and Conor McGregor.