media darling

(idiomatic) A celebrity who is especially popular and who receives frequent and very favorable attention in the news media.

Example: 1986, John Moody, "Gorbachev Loosens the Media's Reins," Time, 30 June:
  TV Correspondent Alexander Krutkov became an overnight media darling with his piercing on-the-spot dispatches.
2008, John Heilemann, "The Meme Prisoner," New York Magazine, 14 Feb. (retrieved 13 Sep 2010):
  â€œ[T]he coverage of Obama has been so positive that you have to call him, though I really hate this term, a media darling.”