Christina Aguilera looked sexy AND maternal in a sophisticated little black dress on stage Saturday.

The Voice mentor performed at the KIIS FM Wango Tango show in Los Angeles and frequently put her hand over her blooming belly.

PHOTOS: Pregnant Christina Aguilera Shows Off Her Bump

Aguilera finished off her look with deep red lipstick and dark eyes.

She is expecting her second child, her first with fiancé Matt Rutler .

PHOTOS: Christina Aguilera Looking HOT for Maxim

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