Sera Hill, 24, from Atlanta. Now this – the last performance of the night -- was so very cool. Christina was the last coach to fill up her team, and she sat through several auditions, turning each of them down (I mean, how disheartening, to know you're performing for only one coach, and to have that coach not spin her chair). Then Sera took the stage with Mary J. Blige's "I'm Goin' Down," and Christina was so impressed that she joined Sera on stage. I mean, got out of her seat, grabbed a microphone and started singing with her. Awesome. Especially considering that their voices are basically identical.