Christina Aguilera hit the stage in New Orleans on Friday, looking happy, healthy, and sporting her ever-growing baby bump. Although she isn't on tour, Aguilera's performance was a part of the annual New Orleans Jazz & Heritage Festival. The Voice judge seemed to have a great time, tweeting all about the show beforehand and afterwards. The 33-year-old singer and her fiancé Matt Rutler were engaged this past Valentine's Day and announced that they'd be having a baby girl together back in March.