No, he's not shacking up with Brad Pitt.

Or adopting little Asian cuties like Pax Thien.

Nick Carter is channeling Jolie by using his star power to help save the world... or at least do good something nice for it. As United Nations Special Ambassador.

Carter talked to Us Weekly about his decision:

"People like Bono, Angelina Jolie, and Nicole Kidman have inspired me to put my celebrity to good use. I have the advantage of reaching multiple generations to make a difference."

The one-time Backstreet Boys star will represent the United Nations Environment Programme, the Convention on Migratory Species, and the Whale and Dolphin Conservation Society for their "Year of the Dolphin" campaign, designed to raise awareness of threats to the survival of dolphins in the wild.

And should you think the position is purely ceremonial and a PR stunt, the older brother of Aaron Carter has words for you.

"I am really excited, but also a little nervous about the responsibility... it is an actual job. There are responsibilities and commitments that I must make to be the voice of dolphins, whales and conservation issues, and the expectations are quite large."

Angelina Jolie would indeed be proud. Especially after seeing this picture of Nick Carter with a cute inflatable dolphin.

We think Nick will have no problem with the new venture. After all, he's clearly already smart enough to know that if there's anything the ladies love more than the Backstreet Boys, it's dolphins and do-gooders who try to protect them.

Yes, even do-gooders those who hang with Paris Hilton and have lame feuds with Jack Osbourne.