"Watch out...another one's getting ready to conquer the world! #driven #diva2," Aguilera captioned the cute Instagram picture.
Summer is the second child for Christina—who had her seven-year-old son Max with ex-husband Jordan Bratman, but Summer is her first child with fiancé Matthew Rutler. Christina infamously posed naked while pregnant with Summer for V magazine, and also headed into the recording studio while enormously pregnant for a cute baby bump moment.
Now that Summer is out and about we can't wait to see more mommy-daughter moments!