• Eminem executive produced the soundtrack for the boxing film "Southpaw," which starred Jake Gyllenhaal.

Eminem executive produced the soundtrack for the boxing film "Southpaw," which starred Jake Gyllenhaal. (Photo : Reuters)

"Rap God" rapper Eminem dissed Rihanna and Gwen Stefani before collaborating with them. In the lyrics of "Medicine Ball" and "Like That," he talked about peeing. Eventually, the Detroit rapper collaborated with the artists in the songs "The Monster," "Love The Way You Lie" and "Kings Never Die."

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"Medicine Ball" was from Eminem's sixth studio album titled "Relapse," which was released on May 19, 2009. In its lyrics, the "Rap God" rapper said he will pee on Rihanna.

Instead of having a bad blood after "Medicine Ball," Eminem and Rihanna went on to collaborate in "Love The Way You Lie," "Love The Way You Lie (Part II)," "Numb" and "The Monster."

In 2013, Rihanna told Complex that she just loves working with Eminem, who is just one of her favorite rappers. She said, "He's a true poet, and I enjoy that about him."

On the other hand, Eminem asked Stefani to "pee pee" on her in the lyrics of "Like That," a comedy hip hop song released as the final single from the "Rap God" rapper's fifth studio album "Encore," which was released on Nov. 12, 2004.

On July 10, the first collaboration song of Eminem and "The Voice" coach titled "Kings Never Die" was released as one of the singles from the Jake Gyllenhaal starrer "Southpaw" soundtrack.

Stefani is not the first "The Voice" season 9 coach Eminem has collaborated with. In 2012, the "Rap God" rapper collaborated with Maroon 5 frontman Adam Levine in 50 Cent's "My Life." However, Eminem and Levine have yet to record a song that features only the two of them.

Recently, a source told Us Weekly that Levine is set to collaborate with "Home Alone" actor Joe Pesci, 72, as they have recorded some music together.