The radiant expectant mother revealed the news on US talk show The View, adding: "I think that's kind of cute".
CLICK ON PHOTO FOR FULL GALLERY
Alicia and husband Swizz Beats, real name Kaseem Dean, already have a son named Egypt Daoud. Swizz also has three children from a previous relationship, Prince Naseer, Kasseem Jr and Nicole.
The songstress announced the pregnancy on the couple's fourth wedding anniversary on June 30, sharing a shot on Twitter in which she's cradling her baby bump while flashing a smile at her husband.
"Happy Anniversary to the love of my life @therealswizzz !! And to make it even sweeter we've been blessed with another angel on the way!! You make me happier than I have ever known! Here's to many many more years of the best parts of life!" she captioned the adorable photo.
Swizz was equally enthuiastic tweeting that "love is life & life is love and we're so excited for another GIFT from up above".