public figure

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A famous person whose life and behavior are the focus of intense public interest and scrutiny.
• noun Law A person who is determined to be sufficiently well-known or famous as to prevail in a lawsuit for libel or slander only when the defendant is shown to have acted with malice.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A famous person whose life is the subject of public interest.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a well-known or notable person