Jagger's daughter Elizabeth also shared the same photo of her younger brother, revealing the newborn's full name.
"So proud of my beautiful baby brother Deveraux Octavian Basil Jagger 💖👼🏻🎉," she wrote.
Deveraux, born on December 8, is Jagger, 73, and Hamrick's first child together.
The couple have been dating since 2014.
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