It has a ring to it!

Christina Aguilera and fiance Matt Rutler have named their newborn daughter Summer Rain Rutler, the singer announced on Twitter Sunday.

"So proud to welcome our beautiful daughter Summer Rain Rutler into the world," the new mom wrote. The Grammy winner gave birth via C-section on Saturday at Cedars-Sinai Medical Center in L.A. This is the second child for the songstress, who also has son Max, 6, from her previous marriage to Jordan Bratman.

Xtina and her beau became engaged on Valentine's Day of this year and shortly after revealed they were expecting. The pair met on the set of her 2010 film Burlesque.

Congrats to the happy family!