Bradley Cooper fans were in for a surprise recently as the actor-director joined Lady Gaga onstage during the latter's Enigma show in Las Vegas. Cooper was in the audience but decided to join his 'Star Is Born' co-star on stage to sing a duet of 'Shallow' - a song from the film that has fetched Gaga a nomination in the Best song category.

Watch: Bradley Cooper joins Lady Gaga on stage for an impromptu duet of 'Shallow' at her Vegas concert

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Watch: Bradley Cooper joins Lady Gaga on stage for an impromptu duet of 'Shallow' at her Vegas concert