Christina Aguilera made her first post-split performance last night in Las Vegas -- as part of a star-studded concert thrown by Justin Timberlake.

Aguilera, who once toured with JT and co-starred with him on "The Mickey Mouse Club," looked incredible while singing hits like "Not Myself Tonight," "Ain't No Other Man," "Fighter" and "Beautiful."

Timberlake also hit the stage at the event -- as well as T-Pain, Lady Antebellum, Elton John, Salt-N-Pepa, Diddy and Selena Gomez -- which was a fundraiser for the Shriners Hospitals for Children.

Check out all the hot performance pics!

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