Christina Aguilera performed while pregnant at Wango Tango on Saturday, May 10. Credit: C Flanigan/FilmMagic

What a way to ring in Mother's Day! Pregnant Christina Aguilera looked radiant at the KIIS FM Wango Tango concert in Carson, Calif. on Saturday, May 10, glowing in a sheer black cutout dress. 

The mom to 6-year-old Max swept her blonde locks up and paired the look with bright red lipstick and a giant smile. Singing her hit "Say Something" with the group A Great Big World, the pop diva and her growing baby bump were on full display. 

Earlier in the month she showcased her vocal talent (and baby-to-be) again, headlining the New Orleans Jazz Festival

The "Beautiful" singer is expecting her second child with fiance Matt Rutler. She got engaged to the production assistant in February, and in addition to preparing to welcome their daughter, Aguilera is also working on a new album. 

"So blissful in taking this time for creating all things blossoming new on the horizon...album, baby & beautiful music to come," she tweeted in April.