Aha! I've found Michael Phelps' Secret

That's right. Michael Phelps is a merman. The scandal was surely going to be exposed at some point. Just remember that you read it here first! Ok, seriously, Phelps and Julianne Moore (here as Ariel aka The Little Mermaid) were shot by Annie Leibovitz for a "Disney Dream Portrait Series"ad campaign.
Yep, just wait till the IOC gets ahold of this image. *shaking my head*

To go see the picture larger, click here and you can see Janet Evans, Rowdy Gaines, Brendan Hansen and Cullen Jones all in the picture, too. I love Cullen Jones. He's too darn cute. You can see more of the Disney Dream Portrait Series here.