Robin Roberts -- P.S. I'm Gay & Have a Girlfriend

Robin Roberts just officially came out of the closet ... telling the world she's gay and has a longtime girlfriend.

Robin just recounted her triumphs over the last year on her Facebook page ... talking about her battle with cancer and how she overcame the odds and regained her health.

In the middle of her Facebook essay she said, "I am grateful for my entire family, my long time girlfriend, Amber, and friends as we prepare to celebrate a glorious new year together."

It's kind of cool the way she did it, she didn't scream it from the mountain tops ... but she revealed her true self in an authentic way.

Good for Robin.