A representative for the organization said that while Carter has yet to do anything for the dolphins, he'll soon start taping public service announcements about the sea creatures that share his vocal gifts. Carter also plans to put his Backstreet Boys-honed talents to use by recording a song in honor of the dolphins.
Pelofsky noted that in the end, whether it's a boy-band singer or A-list actress, most charities welcome the chance to sign on a celebrity: Even if they don't draw in a bigger donor base, the star power helps raise the nonprofit's profile. But there are certain pairings that would probably never work: Say, Lindsay Lohan and MADD or Britney Spears and KidsandCars.org
"Would I ever turn down a celebrity who's interested in helping a nonprofit? Not unless I was working for the Humane Society and it was Michael Vick," Pelofsky said.