Christina Aguilera flaunted her baby bump in a little black dress over the weekend.

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The pregnant star sported a Roberto Cavalli dress and Christian Louboutin heels on Saturday night as she performed at the KIIS FM Wango Tango concert at the StubHub Center in Los Angeles. Photos show Aguilera holding her baby bump as she belted out her tunes.

The 33-year-old was also joined on stage by A Great Big World for their duet, Say Something.

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This isn't the first time Aguilera showed off her growing belly. Earlier in the month, she performed at the New Orleans Jazz Festival in another short black dress emphasizing her pregnancy.

"Owning the blues at NOLA w/ baby girl in tote. #jazzfest2014," she tweeted on May 3 along with a photo of herself on stage. "Pop, soul, and a little rock n' roll! Thanks for inspiring my most eclectic set list yet."

The multi-platinum singer revealed in February that she was pregnant, one week after she announced her engagement to longtime boyfriend Matthew Rutler.

In March, she also reportedly announced that she's expecting a baby girl with Rutler, while performing in Kuala Lumpur, Malaysia. According to Twitter users, Aguilera rubbed her belly on stage and said, "This is her first show."

Aguilera and Rutler, 29, began dating in 2010 after they met on the set of the film Burlesque, in which she starred and he worked as a production assistant.

The Voice coach previously had a five-year marriage to Jordan Bratman, with whom she has a 6-year-old son, Max.

Tags: Christina Aguilera