The two have been beefing ever since the Puerto Rican rap star made his wrestling debut at Royal Rumble back in February when Bad Bunny helped eliminate Miz and his partner, Morrison, from the match ... and hit 'em with a frog splash in the process.
That's when Bad Bunny picked up the mic -- called Miz a "bitch" -- and accepted his challenge to square off at WrestleMania!!
Remember, The Miz told TMZ Sports ... if Bunny grew the stones to get in the ring with him, there would be serious consequences.
"He makes a lot of money being a musician," Miz told us back in January ... "So, go do that. Keep on making that money because the fact is, if you come into the WWE ring, I'm gonna break your jaw and when I break your jaw, you're gonna need a lot of money."
WrestleMania îs just a few weeks away -- who's fired up?!