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Christina Aguilera

Chelsea Lauren/WireImage

Christina Aguilera isn't afraid to show off her baby bump.

The pregnant pop star put her blossoming bump on display in a form-fitting little black dress Saturday night at the KIIS FM Wango Tango concert in Carson, California.

 She wore her blonde locks up, and paired her dress with platform pumps.

The singer was full of energy as she belted out some of her biggest hits.

Aguilera, 33, is expecting a baby with fiancé Matthew Rutler. It's baby No. 2 for Aguilera and her first child with Rutler.

The songstress is already a mommy to 6-year-old Max, her son with ex-husband Jordan Bratman.

Ciara

AKM-GSI

Aguilera wasn't the only pregnant pop star out and about in Southern California.

Mother-to-be Ciara, who's due any day now, wore a flowing white maternity dress to her pal Kim Kardashian's bridal shower in Beverly Hills.

The 28-year-old "Goodies" singer rounded out her ensemble with comfy white espadrilles and wore her long locks down.

These ladies know how to make pregnancy look chic.