Mark Ronson says Bradley Cooper had a ''specific vision'' for his duet with Lady Gaga at this year's Oscars.

The 43-year-old musician and record producer was part of the songwriting team along with Gaga, Anthony Rossomando and Andrew Wyatt that won the Best Original Song Oscar for Shallow from A Star is Born at the 91st Academy Awards on Sunday.

Speaking on The Ellen DeGeneres Show, Ronson revealed it was Cooper's idea for him and Gaga to walk onto the stage from their front row seats at the start of their performance and finish by sitting next to each other at their piano.

Bradley Cooper and Lady Gaga's performance was the talk of the Oscars

"I think he had a specific vision. I heard Lady Gaga talking about it, so I think it was his thing. That probably might be the only time they ever perform that song together so it made it feel really special.

"Afterwards I went up to him and I was like, 'You killed it!' And he was like, 'Really?!' And I was like, 'How can you not know?' But I think that, yeah, he's not a singer so it was so brave of him to go up and do that."

In her acceptance speech, Gaga thanked Cooper for making her dream of becoming a movie star a reality.

"Thank you so much to the Academy for this wonderful honour, to every person in this room, to Mark Ronson, Anthony Rossomando, and Andrew Wyatt, my co-writers," she said.

"To my sister, my soulmate. My family is here, I love you mom and dad. Bradley, there is not a single person in this planet that could have sang with me but you, thank you so much. Thank you for believing in us. Thank you so much."

For more music news, click here