Eminem vs. Jay-Z Beef Erupts: 'Most Overrated Rapper Of All Time' Diss Amid Beyonce Divorce RUMORS, Will Rihanna Rally For 'The Monster' Tour 'Crush?'

Wait - did Jay-Z just diss fellow rapper and former tour-mate, Eminem?

Well, this should be interesting...

UPDATE: Eminem vs. Jay-Z Beef HOAX: Fake 'Most Overrated Rapper Of All Time' Diss Intensifies, Kanye West Agrees 'Drugs & Laziness' Ruined White 'Rap God' 

Eminem Wins, Twitter Fans Bash Jay-Z For Diss, 'The Monster' Prepares For Dr. Dre's ALS Ice Bucket Challenge?

In a recent interview with Music One, the Magna Carta emcee allegedly deemed Slim Shady the "most overrated rapper of all time." Ouch!

Talking about the MMLP2 superstar's fame, HOV reveals:

"I don't really understand the appeal of dude... He dropped a few hot verses back in the day, but he's been mad average for many years now. He is probably the most overrated rapper of all-time, but he did really well targeting his audience. He is a genius in that sense, but in the bigger scheme of things, there are a million rappers who were and are lightyears ahead of him."

Apparently, Jay's simply confused why Em outsold so many other legendary hip-hop artists:

"When you really think about it, it's ridiculous that Em has outsold so many rappers with real talent. 2Pac, Nas, Big and Kanye and myself would rap circles around him. I am not trying to take away from his talent, but in all reality, his catalogue can't match mine."

According to Beyonce's beau, Shady hasn't released anything too exciting since his last collaboration on the hit 2012 track, Renegade. "The last hot verse he did was on my track," Jay muses:

Throwing some major shade! Will the Detroit native respond to HOV's "average" remarks?

Despite Jay's comments, Em has proved himself within the industry - he's sold over 44.91 albums and counting so far.

Shady's currently touring with pop sensation Rihanna, who always had an ongoing "feud" with Queen Bey. Wonder if "The Monster" duo will retaliate?