Los Angeles - Kelis reportedly gave birth to her second son in November.
The 36-year-old singer is said to have extended her family last month, but the baby's name and weight have yet to be revealed.
A source told E! News: "Kelis has a healthy baby. She's thrilled."
The baby's father is Kelis' husband Michael Mora. The singer is also mother to six-year-old son Knight with her former spouse Nas.
Kelis has been fairly quiet on her social network pages apart from promoting her cookbook My Life on a Plate.
Prior to the baby's birth, Kelis said her eldest son was more than a little excited about having a sibling.
She told Britain's HELLO! magazine earlier this year: "Knight is just spectacular. He is going to make the most incredible big brother.
"He's always asking, 'Can the baby hear me? Can he see what I'm doing?'
"Even when we're out in public he'll lift my shirt and kiss my stomach. When I had a 4D scan he said, 'I knew it. He looks like me.'"