The singer's boyfriend, relationship expert and motivational speaker Rob Hill, Sr., reportedly revealed the news during a New Year's Eve (31Dec15) service at the Mount Lebanon Baptist Church in Norfolk, Virginia.
LeToya performed songs with The Mount's Unity choir, before Rob addressed the packed congregation as part of his Hope For Love session, during which he casually let the news slip.
"He talked about his amazing year of embracing 'Hope For Love' in his own life and just kinda confidently rattled off that he now had a fiancee!" a source tells TheYBF.com.
Rob didn't mention LeToya by name, but the singer was spotted wearing a gold band on her left ring finger at the event.
The couple, which has yet to comment on the news, went public with its relationship in October (15). Luckett and Hill, Sr. are currently working together on a new TV comedy series, titled Here We Go Again, for America's TVOne network.