Eminem and Rihanna perform on the The Monster Tour

Eminem and Rihanna perform on the The Monster Tour at the Rose Bowl on Thursday, August 7, 2014, in Pasadena, California.

Jeremy Deputat

Eminem and Rihanna saved the biggest splash of The Monster Tour for last. Literally.

Eminem chose the duo's Saturday night show at Comerica Park in his home town of Detroit -- the sixth and final date of their tour -- to answer Dr. Dre's ALS Ice Bucket Challenge. As the MC and Rihanna were walking off the stage at the end of the show, Eminem's hype man Denaun "Mr." Porter stopped them and reminded his boss of Dre's challenge, which Eminem had said previously accepted via Twitter. He then sat in a chair on stage while Rihanna doused him with ice-cold water.

As he shook himself off, Eminem quickly issued his own challenges -- first to Porter, with Eminem doing the honors himself, then to Rihanna, who asked the sold-out crowd of around 45,000, "Detroit, what you think? Should I do it? I'm from the islands; I don't do this ice shit! This ice shit doesn't work for me." Nevertheless, Rihanna 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 for an Ice Bucket Challenge.

 

 

Eminem and Rihanna are the latest A-listers to get in on the ALS Ice Bucket Challenge, which helps spread the message about Lou Gehrig's disease. Those challenged have 24 hours to post their own ice bucket challenge video or they have to donate $100 to the cause. Many celebrities are choosing to do both.

Other charttoppers who have accepted the challenge include Chris Martin, Lady Gaga, Katy Perry, Justin Bieber (twice), Taylor Swift, Selena Gomez, Justin Timberlake, Lil Wayne and many, many more.

The Challenge gave a different twist to the pair's second night in Detroit, which was otherwise identical to Friday's show -- and to the four previous dates in Pasadena and East Rutherford, N.J., where Eminem and Rihanna smoothly shared the stages for two-and-a-half-hour shows that ran through 50 mostly partial songs, including their four recorded duets ("Numb," "Love the Way You Lie," "Love the Way You Lie II," "The Monster") and plenty of their own hits. The Detroit shows had some variations, most notably Eminem's salutations to "everybody who supported me from the beginning." He dedicated "Like Toy Soldiers" to his slain former hype man and D-12 partner Proof, and "Not Afraid" to the city itself. For Friday's show, meanwhile, Rihanna smartly paid homage to another Detroit music icon, sporting an Alice Cooper T-shirt. (Bon Jovi was Saturday's choice, however.)

Expected guest star appearances did not transpire on stage, but backstage guests included Kid Rock on Friday and Amy Adams, in town filming "Batman vs. Superman: Dawn of Justice" on Saturday. Various athletes from the Detroit Lions, Red Wings and Pistons teams also attended the shows, as well as fellow rappers Royce da 5' 9" (Eminem's Bad Meets Evil partner and a member of his Shady Records' Slaughterhouse group) and Trick Trick.

With The Monster Tour wrapped, Eminem moves on to the Austin City Limits Music Festival on Oct. 4 and 11, while Rihanna returns to work on her eighth studio album.