GRAMMY PERFORMANCES Grammys 2015: Ariana Grande Performs 'Just a Little Bit of Your Heart'

Ariana Grande performs onstage during The 57th Annual Grammy Awards at the STAPLES Center on Feb. 8, 2015 in Los Angeles, California.

Ariana Grande only wants a little bit of your heart at the Grammys.

Anna Kendrick introduced Grande, who sang "Just a Little Bit of Your Heart" amidst the lights and fog on stage.

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The singer's slowed-down ballad, accompanied by a piano, impressed the crowd.