The newborn is Aguilera's second child, but her first with fiance Matt Rutler.
Christina Aguilera and Matt Rutler celebrated the birth of their August baby by giving their daughter a super seasonal name.
The "Beautiful" singer revealed via Twitter: "So proud to welcome our beautiful daughter Summer Rain Rutler into the world."
What do you think of the name Summer Rain? Tweet us using #ETNow and hit the comments below with your thoughts.
Baby Summer is Aguilera’s second child, joining her 6-year-old son from her marriage to Jordan Bratman, but is her first child with fiancé Matt Rutler. Aguilera has yet to share an official photo of her new bundle of joy, but she was certainly not shy about showing off her baby bump over the last few months.