The "Glee" star showed up on the red carpet wearing a long black gown with a train and a keyhole cut-out on the chest that showed off ample cleavage.
Rivera plays lesbian cheerleader Santana Lopez on the popular Fox series. She recently got engaged to rapper Big Sean.
Danity Kane singer Aubrey O'Day also showed off her curves at the music event. She wore a bright red dress with a plunging neckline and slits up the thighs that showed off her legs.
Last week, O'Day posted a photo of her bare derriere on Instagram after she ripped through a tight dress she was trying on.
Check out more photos of Naya and Aubry...