Robin Roberts thanked her longtime girlfriend, Amber Laign, in a year-end post published on Dec. 29 on the ABC News anchor's Facebook page.
The message, which follows Roberts' battle with a life-threatening illness, is the first time the "Good Morning America" anchor has publicly acknowledged her 10-year, same-sex relationship with Laign, a massage therapist from the San Francisco Bay Area.
Roberts' post was confirmed by ABC News spokeswoman Heather Riley.
Sunday was the anniversary of Roberts' 100-day milestone following a bone marrow transplant in September 2012 for treatment of myelodysplastic syndrome, a rare blood and bone marrow disease.
In May, Grand Central Publishing announced Roberts, one of the most popular figures in morning TV news, will write a memoir about her battle with MDS and the life lessons she continues to gather following her return to "GMA" last February.
In May 2012, President Barack Obama first came out in support of marriage equality in an interview with Roberts.