Gaga took to the stage in a glimmering gold trouser suit and a platinum bold wig, as she began singing her current hit single, 'Do What U Want'.
Voice judge Christina soon stepped on stage to join the popstar, and not only did the pair dazzle with their frocks, but they wowed with their vocals on the uptempo track.
Christina, who wore a slinky gold dress, electrified the crowd with Gaga, and in the middle of the song, the pair got intimate as they acted on stage.
Going out with a bang, the female singers linked arms and drank out of a champagne glass as the song ended.
After their performance, Christina took to Twitter to praise Gaga. She said: "She is such a powerhouse vocalist and I was honoured to join the stage with @ladygaga tonight on #TheVoice! xo."
And 27-year-old Gaga returned the compliment, saying: "@xtina thank you for performing with me, your heart is as big as your voice. Such a fan for so long, I can't believe we shared the stage."
In response, Christina tweeted: "@ladygaga Feeling is mutual. You're a beautiful person - inside & out!! Love u gorgeous!! xx."
After so much mutual praise, we think these two should definitely release a single together!
'Do What U Want', which features American R&B singer R. Kelly, was released back in October and is the second single to be lifted from Gaga's third studio album ARTPOP.
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Listen to 'Do What U Want' in the video below: