The 'Girl On Fire' star, 33, posted the photo on her official Instagram page on Saturday (20 September) hoping to raise awareness of the We Are Here movement.
In the arty snap, Alicia looks beautiful as she bares her naked baby bump, covering her breasts with her hands to protect her modesty.
With braided hair and natural make-up, Alicia is staring straight at the camera - but it's the peace sign painted on her swollen belly that we're drawn to.
Alongside the photo, Alicia says: "It's you and me on a mission to create a kinder and more peaceful world. The #WeAreHere Movement begins today. Read more here and thank you @nickkristof for sharing your bright voice with all of us."
Some of her 20 million Twitter fans were quick to show their support, with one saying: "I love you so much for doing this Alicia, you are truly amazing and inspiring."
Alicia has started the We Are Here movement to "channel her music and her fans to social justice causes, from stricter gun laws to criminal justice reform, from gay rights to global girls' education."
Alicia is expecting her second child in December with husband Swizz Beatz. They already have a son Egypt, who is three.
She is currently working with Pharrell Williams on her sixth studio album, set for a 2015 release.
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