(LOS ANGELES) -- Now that Lady Gaga and Bradley Cooper are officially going to sing "Shallow" at the Oscars, Cooper says that -- unlike his surprise performance with Gaga in Las Vegas -- he really needs to start rehearsing.
Cooper says he and Gaga pulled the performance together in two days.
He explains, “I’d thought about it and called [her and said] maybe I’d go to the show and then I knew she was singing 'Shallow' for her finale. And I thought, 'I don’t know, maybe if she wants to bring me up, let’s see if it’s not horrendous.'”
He adds, "That was an amazing experience. But no, I want to work and, like, rehearse [before the Oscars].”
To that end, Cooper is hoping to get back together with his vocal coach, Roger Love, who helped him create Jackson Maine's singing voice for A Star Is Born.
“I couldn’t sing before this movie and so, in terms of being able to sing in front of people, it’s very nerve-wracking. It’s not easy what they do,” he tells ET. “We worked tirelessly [to prepare for the movie]."
Cooper says he's already called Love to arrange some rehearsal time, but he'd better start soon: The 91st annual Academy Awards air February 24 on ABC.
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