It’s the second child for the 33-year-old star, who already has a son, Max, 6, from her previous marriage to Jordan Bratman.
Aguilera revealed she was expecting a daughter in March.
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“I’m really excited to meet our baby girl,” she told PEOPLE in June. “This has been a very easy and enjoyable pregnancy.”
The Voice coach and Rutler, a film producer, have been engaged since February.
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