Christina Aguilera Is Pregnant, Proud, and Performing

Christina Aguilera is one hot mama!

On Saturday, the 33-year-old songstress hit the stage at the KIIS FM Wango Tango concert in Carson, California. Clad in a clingy black dress with sexy sheer panels, the expectant mom proudly showed off her growing bump as she belted out hit songs, including "Say Something." She wore her hair in an elegant up-do and finished her look with red lipstick — and truly wowed the crowd.

But this isn't the first time "The Voice" coach proved she can do it all. Just a little over a week before, Christina took Louisiana by storm, performing at the New Orleans Jazz & Heritage Festival. For that go-round, she opted for a bedazzled mini-dress with matching embellished tights and a sparkly sailor hat. Yes, her outfit was as fabulous as it sounds. And she clearly loved it, since she shared her own snapshot of the glittering look.

It seems that the pop star is showing no signs of slowing down despite her pregnancy. Already a mother to 6-year-old Max (her son with ex-hubby Jordan Bratman), she doesn't appear the least bit overwhelmed with the prospect of expanding her brood. Since the news broke that she was expecting again (this time with her current fiancé, Matthew Rutler), the diva has been out and about in skin-tight ensembles that highlight her burgeoning midsection, and looking better than ever.

And even though her Mother's Day tweet was nothing more than a (lame!) promotional tool for her perfume, we'll let it slide—because she's taking the concept of a working mom to a whole new level, and she looks amazing doing it.

Whatever Xtina's doing to celebrate the holiday ... she deserves it.