A representative for the Grammy-winning performer confirmed that the singer is pregnant.
Keys posted a photo with her baby bump on Instagram on Thursday, which also marked her fourth wedding anniversary to producer-rapper Swizz Beatz, who also posed in the picture.
Keys wrote that their anniversary was sweeter because they have "been blessed with another angel on the way". She did not offer any more details about the pregnancy.
She gave birth to her son Egypt in 2010.