• Born Marshall Bruce Mathers III, Eminem is a Grammy-winning Detroit rapper.

Born Marshall Bruce Mathers III, Eminem is a Grammy-winning Detroit rapper. (Photo : Reuters)

Gwen Stefani has recently dished on her "Kings Never Die" collaborator Eminem. The collaboration song of the No Doubt front woman and the Detroit rapper will be one of the songs to be featured on the boxing film "Southpaw" starring Jake Gyllenhaal.

During the Beauty Con tea party for the launch of Stefani's Harajuku Lovers fragrance and Harajuku Lovers accessories, the No Doubt front woman was asked by Entertainment Tonight about how she and Eminem get together to collaborate on "Kings Never Die."

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"He's so incredible," Stefani said of Eminem. "He's a real artist. He's a real weirdo. I just finally got the call. It was one of those days where they were like, 'Can you come do this?' And I was like, 'Really? Really?' And they were like, 'It has to be done today.' And I was like, 'Okay!' And I just made it happen."

"Kings Never Die" was released on July 10 while "Southpaw" will hit theaters on July 24. Joining Gyllenhaal in the boxing film's cast are Eminem's protégé 50 Cent, Rachel McAdams, Forest Whitaker, Naomie Harris, Rita Ora, Miguel Gomez, Victor Ortiz, Clare Foley and Beau Knapp, among others.

In other news, Stefani is set to create an eyewear collection for her clothing and accessories brands L.A.M.B. and GX by Gwen Stefani in cooperation with Tura Inc. The line of glasses will be launched early in 2016.

As she told WWD, the eyewear collection was something Stefani has "wanted to do forever" as she has "probably five drawers" full of glasses at home.