Christina Aguilera is at it again! For the second week in a row, she left her big, red coache's chair to hit the stage for a performance on The Voice.

This week, she was joined by fellow mentor Blake Shelton to perform their song Just a Fool from Xtina's new album Lotus, which debuted last Tuesday. Unlike her faster tracks like Your Body, the first single, this song is a powerful ballad that the duo performed with simple stage-setting and great emotion.

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Last week, Christina got on stage with CeeLo Green for a much more ecclectic performance of their duet Make the World Move. And don't worry about fourth and final coach Adam Levine feeling left out -- she performed their duet Moves Like Jagger with his band Maroon 5 onstage last season!

It's so great to see Christina really showing off her powerful and incredible vocals, which sometimes get overshadowed in her more up-tempo numbers, on Just a Fool. What did you think of the performance?!

Video courtesy of: NBC 'The Voice'