Photo by Christopher Polk/Getty Images for MTV

Rihanna and Eminem joined the celebrity ranks in the ALS Ice Bucket Challenge over the weekend during the final show of their six-date The Monster Tour.

As they were leaving the stage following their final bows on Saturday (August 23) at Detroit's Comerica Park, Eminem was stopped by his hype man, Denaun Porter, who reminded the rapper of an outstanding challenge from good pal and mentor Dr. Dre.

Eminem allowed Rihanna to do the dousing honors, then immediately challenged her and Porter. Porter took the icy bath first, while Rihanna milked the moment, asking the crowd of 45,000 "Detroit, what you think? Should I do it? I'm from the islands; I don't do this ice s***! This ice s*** doesn't work for me."

Nevertheless, she took the plunge as Eminem's band played Vanilla Ice's "Ice Ice Baby" in the background.

Eminem also called out "Berzerk" producer Rick Rubin, who was not at the show, for an Ice Bucket Challenge.

Kid Rock and actress Amy Adams, in Detroit filming "Batman vs. Superman," were among those who attended the two shows. 

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