I know that there is Neil Patrick Harris, Ellen DeGeneres, and Anderson Cooper.
If I remember any more I'll let you know :)

^^^ Those that hetalianstella said, Neil Patrick Harris/David Burtka and Ellen DeGeneres/Portia De Rossi are two of my all time favorite gay couples. <3

Also out: Amber Heard, Matt Bomer, Chris Colfer, Wanda Sykes, Adam Lambert, Ian McKellen, Jane Lynch, Alicia Keys, Ricky Martin, Clay Aiken, Elton John, Alexander McQueen, Lance Bass, Jim Parsons, Sara Gilbert, Sean Hayes, Rosie O'Donnell, Jonathan Knight, Zachary Quinto, T. R. Knight, Chely Wright, Jesse Tyler Ferguson, Cynthia Nixon, Dan Kloeffler, Sean Mayher..

Many are out and -Bi-, also.

Jodie Foster