The 34-year-old singer welcomed her baby boy to the world on December 27, 2014, reported Us magazine.
The black-and-white photo shows Keys, Swizz Beats and their children posing for a family portrait with baby Genesis.
Swizz Beats (real name Kasseem Dean) also took to Instagram to show off the latest addition to their household with a picture that celebrated the "Dean boyz".
Genesis is the second child for the couple, who were married in 2010. Their first son, Egypt Daoud, was born in October 2010.
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