Christina Aguilera Welcomes Baby Girl With Fiance Matthew Rutler (UPDATE)

Baby Xtina has arrived!

Christina Aguilera welcomed a daughter with fiance Matthew Rutler. This is the first child for Rutler and the second for Aguilera, who has a 6-year-old son Max with her first husband, Jordan Bratman.

Aguilera gave birth on August 16 via a C-section at Cedars-Sinai Medical Center in Los Angeles, according to US Weekly. Neither Aguilera or Rutler has revealed their daughter's name yet.

Although she kept quiet about the pregnancy in the beginning, the 33-year-old singer was eager to share photos and updates on Twitter once she started to show.

"I love the theatrics, and entertaining is what I was put on this Earth to do, but there's a superficiality to it," Aguilera told Marie Claire of motherhood in 2012. "When I was younger, I lived for my art and my work; I wanted it to be 'Back to Basics' all the time. Becoming a mother has helped me to realize who I am aside from my career."

UPDATE 8/18 -- Aguilera has revealed her newborn daughter's name on Twitter, two days after giving birth:

Welcome to the world, Summer Rain!