• Eminem poses for a photo with Carson Daly on set of TRL at the MTV Studios in New York City on May 10, 2000.

Eminem poses for a photo with Carson Daly on set of TRL at the MTV Studios in New York City on May 10, 2000. (Photo : Getty Images/Scott Gries)

Two days after turning 44, Eminem confirmed that he is back in the studio working on a new album. It will be his ninth studio album, whose title has yet to be announced.

While announcing his ninth studio album, Eminem released a new song titled "Campaign Speech," which is almost eight minutes long. It covers a wide range of topics and makes references to several celebrities.

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In "Campaign Speech," Eminem disses Republican presidential candidate Donald Trump. The rapper also mentions mystery novelist Agatha Christie, singer Robin Thicke and "Baywatch" star David Hasselhoff, who recently signed an exclusive worldwide branding and licensing representation agreement with Prominent Brand + Talent, Licensing reported.

Neither Thicke nor Hasselhoff has commented on Eminem's "Campaign Speech." Thicke collaborated with T.I. in the song "Blurred Lines" while Eminem is the featured artist in T.I.'s song "That's All She Wrote."  

On Oct. 15, Saturday, Thicke performed Tidal X: 1015 in Barclays Center in Brooklyn. He appeared to have gained weight during his benefit concert performance onstage, Daily Mail reported.

On the other hand, Hasselhoff is set to star in "Baywatch," which will hit theaters on May 19, 2017. Directed by Seth Gordon, the comedy film also stars Alexandra Daddario, Pamela Anderson, Charlotte McKinney, Kelly Rohrbach, Priyanka Chopra, Hannibal Buress, Dwayne Johnson and Zac Efron, among others.

Meanwhile, the last film Eminem appeared in was in "The Interview," which was released on Dec. 24, 2014. The "Rap God" rapper made a cameo appearance in the comedy film, which starred James Franco, Seth Rogen, Randall Park, Diana Bang and Lizzy Caplan.

Listen to Eminem's "Campaign Speech" here: