"I don't always get naked, but when I do, it's for a good cause," Grand, deemed country music's first openly gay male star, wrote on Facebook. "I didn't want to waste fresh water (since there are so many without) so naturally, I jumped into Lake Superior, naked."
Grand shared a steamy photo of his brisk dive, and will also be donating money to ALS as well as two other charities he says he feels passionate about, including a local LGBTQ homeless youth charity. He joins a growing list of LGBT and queer-friendly celebrities, including Margaret Cho and Neil Patrick Harris, who've taken the ice bucket plunge.
Check out Grand au naturel below: