Eminem is an "inspiring and intimidating" collaborator.

Skylar Grey - who penned the rapper's duet with Rihanna, 'Love the Way You Lie', as well as 'I Need A Doctor' for Dr. Dre - enjoys working with the 'Real Slim Shady' hitmaker because of his "rare" talent.

She said: "Eminem makes fun of me. But he's a rare breed of an artist that doesn't come along every day, so being able to be in a room with him and see his creativity at work was both inspiring and intimidating."

Skylar also revealed that 'Love the Way You Lie' was inspired by the vicious cycle" of her relationships with "assholes".

She explained to NME magazine: "It wasn't necessarily about literal violence in a relationship, but that vicious cycle of somebody who keeps you on your toes because they're kind of an asshole. I do tend to fall for assholes because they keep me on my toes and I don't get bored. That's what I wrote it about."