The pair took the challenge as they wrapped up their Detroit stop on their tour in Comerica Park in front of a huge 41,000 concert-going audience.
Eminem took the challenge first as RiRi — looking like she was enjoying it — poured the bucket of ice over his head.
RiRi went next, and although she’s that chick, she still looked devastatingly washed up from the challenge.
Due to the social media phenomenal impact of the #alsicebucketchallenge, the cause has raised more than $40 million thus far.
Watch the challenge below: