Lady Gaga surprises audience by bringing Bradley Cooper on stage to sing 'Shallow' live in Vegas!

Lady Gaga fans in Las Vegas were treated to an extra special performance when none other than her A Star Is Born co-star Bradley Cooper made a surprise appearance on stage!

Marking the first time they have ever performed their duet 'Shallow' together in front of a live audience, the pair had the crowd ecstatic with joy as they belted out the Oscar-nominated hit as the closing number of her residency show at the MGM Park Theater.

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Luckily for us at home, the performance was captured on video, with footage showing the pair embracing before Gaga settled at a piano and Cooper took his spot next to her.

Thanks to the film, the 'Bad Romance' singer has been nominated for her first Academy Award as an actress and has become the first artist to be nominated for Best Actress and Best Original Song in the same year.