Eminem and Rihanna made a big splash at the final concert date of their Monster Tour on Saturday night (Aug. 23). The dynamic duo decided to participate in the ALS Ice Bucket Challenge at Comerica Park in Em's hometown of Detroit.

As the show was about to end, hype-man Denaun "Mr." Porter reminded Em that he had to do the ice bucket challenge after being called out by his mentor Dr. Dre.

Although he was hesitant at first, the Motor City rhymer obliged "Mr." Porter. Em sat firmly in his chair and Rihanna joyously doused him with ice-cold water.

"If this wasn't for charity, I would be so f---ing mad right now," said Em as he tried to shake off the shock of freezing water hitting his body.

But it wasn't over yet.

"Mr." Porter and Em set their sights on Rihanna and told her that she had to do the challenge as well.

"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," she asked the crowd.

Sorry Ri-Ri, you are in Detroit and you are about to get wet.

As the band played Vanilla Ice's 'Ice, Ice Baby,' The Bajan singer sat in the chair and received a huge bucket pot of ice-cold water.

And like the trooper that she is, Rihanna enjoyed her cold bath.

Oh, and "Mr." Porter, got dumped with water as well.

Afterward, Eminem nominated 'Berzerk' producer Rick Rubin to do the watery challenge.

Eminem and Rihanna are the latest celebrities to get involved in the ALS Ice Bucket Challenge. Artists Drake, Lil Wayne, Chris Brown, Jennifer Lopez, Tinashe, Tyga, Justin Timberlake, Katy Perry, G-Unit and many others have performed the challenge.

However, we must mentioned that rapper Tech N9ne took the Ice Bucket Challenge to the next level by getting dumped with six buckets of ice-cold water and jumping in a pool of ice water. What a guy!

Watch Eminem and Rihanna get all wet for a good cause.