I’ve said for a while now that Mariah’s done a lot of wetlook stuff. Let’s take a look.
Here she is collaborating with Ne-Yo for a track called “Angels Cry”. Mariah sings in the rain like, constantly during this video.
You could say she sings through the rain. “Angels Cry” wasn’t the only one by a longshot. There’s another one called… well, “Through the Rain”. 1:54 onwards for the actual rain.
It’s not just rain either. In “Dreamlover”, Mariah swims in the sea (more likely a tank, similar to Evanescence’s Amy Lee or In This Moment’s Maria Brink, only with a much less interesting tune in my opinion) in her clothes.
She’d repeat this to a lesser extent in “My All”.
My personal favourite comes from “Honey”. Mariah dives into a pool at 2:14, giving us a nice underwater shot where she sheds her clothes and then re-emerges.
It’s not just videos that she’s been wet in. How about her performance at the 2005 VMAs? The performance itself starts at 1:05 while Mariah’s little bit of wetness begins at 5:12. There’s really more male wetness in this courtesy of her backing dancers, but I feel it’s still relevant.
And finally, The WAM Bank has a few pics which may be of interest. Screencaps from videos (including one I haven’t identified yet and probably won’t without tip-off – wetlook’s not really my thing and Mariah Carey’s music certainly isn’t), some magazine scans, that sort of thing.
The things I put myself through for you people! 
