Watch Ariana Grande & Christina Aguilera Duet on 'The Voice'

Ariana Grande and Christina Aguilera battled in out with vocal runs on The Voice on Tuesday.

The season finale of the show had room for only a few divas--including winner Alisan Porter--so Ari and Xtina made a duet out of "Dangerous Woman," after Grande made a guest appearance by performing her new single "Into You."