The star shared the happy news with her 19 million Twitter followers on her fourth wedding anniversary, which fell on 31 July.
The No One singer shared a sweet picture of the couple, who already have a three-year-old son named Egypt Dean. In the snap the pair look blissfully happy as they cradle Alicia's sizeable baby bump.
"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 wrote alongside the snap.
Rapper Swizz, real name Kasseem Dean, also wished his "goddess" a happy anniversary and revealed his excitement about the future arrival.
"Love is life & life is love and we're so excited for another GIFT from up above 👼 Happy Anniversary my Goddess 🙌 4 years of greatness & cheers to 100 plus more inshallah 🙏 @aliciakeys ❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️"
Alicia Keys and husband Swizz Beatz shared their exciting news with a sweet snap
Alicia and Swizz married on the French island of Corsica on 31 July 2010. The Fallin' singer wore an ivory silk, georgette-draped goddess gown for her big day.
The then-pregnant Alicia looked every inch the glowing bride as she walked down the aisle in a bespoke Vera Wang dress that showed off her growing bump.