Christina Aguilera's

The pop star looked beautiful during her performance at KIIS FM's Wango Tango on Saturday in Los Angeles.

Rocking a sheer lace LBD, with her hair pulled back in an elegant updo, the former "Voice" coach put her budding baby bump on display.

The 33-year-old also sported some super high heels for the show -- clearly, the blonde beauty's not letting her pregnancy get in the way of her sexy style! 

Christina's pregnancy news broke just one week after she announced that she was engaged to boyfriend Matt Rutler. 

The cute couple met on the set of "Burlesque" back in 2010 while she was going through a divorce from her husband Jordan Bratman.

What do you think of Aguilera's look? Tell toofab in the comment section below and click "Launch Gallery" above to see even more expecting stars!

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