Barcroft Media—Barcroft Media via Getty Images                                                                                                                                                                                                                                                               First time ever on Saturday night in las vegas.Lady Gaga and Bradley Cooper sing in pivotal song from the movie, A Star is Born            
  The two stars at the Park Theater at Park MGM to sing their duet, “Shallow,” live for the first time ever. After Cooper joined her on stage he joked that he couldn’t “hear anything” and has “never used” in-ears before . Throughout the performance Gaga played the piano while Cooper stood near her.  (Photo: Denise Truscell/WireImage)                                                                                                                                                                   The performance comes during what has already been a busy award season for the actors. “Shallow” won a Golden Globe for Best Original Song and was nominated for an Academy Award for the same prize. The actors and the film were nominated for Best Actress, Best Actor and Best Picture in both the Golden Globes and the Oscars.