• Eminem collaborated with No Doubt front woman Gwen Stefani in the song "Kings Never Die," which is featured in the "Southpaw" film starring Jake Gyllenhaal.

Eminem collaborated with No Doubt front woman Gwen Stefani in the song "Kings Never Die," which is featured in the "Southpaw" film starring Jake Gyllenhaal. (Photo : Reuters/Mario Anzuoni )

An undated letter "Phenomenal" rapper Eminem penned to Afeni Shakur, the mother of Tupac Shakur, along with a drawing he had made of the late rapper that appeared in the 2008 book "Tupac Remembered," has gone viral after a Reddit user posted them online.

In the letter posted by the Reddit user, Eminem told Afeni, "Thank you for always being so kind to me. You are a true Queen, and I mean that in every sense of the word. I will never forget the opportunities you have given me. You will always be in my heart, my thoughts and my prayers."

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Eminem also told Afeni in the letter that she has no idea how much her son and his music have inspired not only the hip-hop world but also his whole career. The Detroit rapper pointed out that Tupac "was and still is the true definition of a 'soldier.'"

According to a citation in the 2008 book "Tupac Remembered," the letter, along with the sketch, is on display at the Tupac Amaru Shakur Center for the Arts. According to Billboard, Afeni has given JAM, Inc., which she has been working with since 2013, access to everything in her collection.

Meanwhile, Eminem's new collaboration song with No Doubt front woman Gwen Stefani was released on July 10. Titled "Kings Never Die," the single will be featured in the Jake Gyllenhaal starrer "Southpaw," which will hit theaters on July 24. In a recent interview with Entertainment Tonight, Stefani has nothing but praises for Eminem.

"He's so incredible. He's a real artist," Stefani said of Eminem, who also recorded "Phenomenal" for "Southpaw." On the other hand, she added, "He's a real weirdo."