Gaga brings out Cooper for duet

The audience that attended Lady Gaga's 'Enigma' show last night in Las Vegas got a lot more than they bargained for when Bradley Cooper emerged for a surprise duet.

The show was the last for Gaga's residence at the venue, and fans were beyond amazed when they saw Cooper take the stage with Gaga.

Shallow, the song that they performed, won a Golden Globe for Best Original Song earlier this month, and was nominated at the Academy Awards for the same prize.

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Check out the full performance above!