Eminem, Mariah Carey beef reignited: 'MMLP2' rapper 'shaded' on 'Watch What Happens Live,' diva names nice things about candy M&Ms [VIDEO]

If you're a fan of either Eminem or Mariah Carey, you know that they're NOT the best of friends. Slim Shady constantly rips apart the former "American Idol" diva in several of his rap songs, and "The Art of Letting Go" songstress isn't too fond of the Detroit emcee, either. Want even more proof?

On Sunday evening's episode of "Watch What Happens Live" with Andy Cohen (Dec. 22), Carey was asked to name three nice things about Eminem during the show's popular "Plead the Fifth" segment. And this is what she said:

"They come in a package that you can carry around wherever you go..."

That's right, the "#Beautiful" songstress just complimented the chocolate candy M&Ms, not the actual person.

Start watching the clip at around the 16-minute mark:

The entire interview is rather entertaining... Carey bad talks, A LOT. If you have the time, Mstars recommends watching the entire thing as today's guilty pleasure.

But "throwing shade" at Eminem is by far the best part.

Apparently the two singers dated at some point in time a few years ago, and things turned rather sour. They've been talking crap about each other ever since.

Wonder what Shady's reaction might be - is another diss track on the horizon?