"It was a spontaneous thing for my fiancé," she said before ringing in the New Year at LAVO Las Vegas "He just felt it."
The R&B singer and former Dancing with the Stars contestant first went public with her romance with music executive Ryan Press on New Year's Eve 2011, cuddling at a Las Vegas party.
On Monday, they were back in Vegas, but this time she was sporting a glimmering ring. Although Brandy, 33, told PEOPLE in March that she let Press know she'd "marry him with a bubble gum ring," the sparkler she did receive has impressed her.
"He worked really hard on the ring. I'm not a big diamond girl, but I really love this diamond he did," she said. "It just represents how he feels about me, and I'm really blessed to have someone like him in my life. He's truly a gift."