What's a wrestling match without some good old-fashioned fight music? There's no doubt that John Cena will be pumped when he enters the ring Sunday night (April 1) against the Rock for the main event at WrestleMania XXVIII, and MTV News' 2011 Hottest Breakthrough MC Machine Gun Kelly will have a little something to do with that.

When the 6-foot-1, 251-pound John Cena makes his way to the square, MGK's "Invincible" will be blaring through the sound system at Sun Life Stadium in Miami Gardens, Florida. The Rock, meanwhile, has chosen to march out to a Flo Rida tune. "Any Flo Rida song will get you excited, will make the club move, but I heard Machine Gun Kelly's 'Invincible' and I wanted to fight somebody," Cena told MTV News about the Bad Boy Records signee.

Cena knows a thing or two about hip-hop music. In 2005, he released his debut rap album, You Can't See Me, and he sees a ton of promise in MGK. "You can tell he's hungry. I think that's when your true love for hip-hop shows, when you're hungry enough to put your heart and soul into a track, into a record," he said. "I met this kid in person, the music does him justice. The kid's hungry, man. He's gonna be at WrestleMania and I'm happy for him. Hopefully he can keep the momentum going."

The Cena-vs.-Rock match is being billed as the biggest WWE match of all time, and JC is taking it very seriously. He promised that the Rock will both "pee and crap" himself in the ring when they square-off.

"I got you, man," Cena warned the wrestler-turned-actor. "I know things about you that you don't even know about yourself," he said, addressing the Rock, who's taking a short break from Hollywood to return to the ring, directly. "April 1, we're gonna see who the greatest of all time is."

Who do you think will win the main event at WrestleMania XXVIII? Tell us in the comments!