Bradley Cooper is once again singing the praises of Lady Gaga.

De Niro first noted Cooper had prepared to shoot the film for some time.

So yeah, three years, Cooper confirmed.

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Credit: Neal Preston/Warner Bros.

So I knew that I had to do it.

Whether it fails or not, I knew that I had to try.

And I wound up absolutely loving it.

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Neal Preston/Warner Bros.

I dont wanna say too much because maybe youll hate the movie, but I love it.

I really love it.

Its the movie I set out to make, which is hard to say, he said.

We also have the benefit of editing, Ive been editing for a long time.

I just hope I get to keep doing it.

He also called his titularStar, Lady Gaga, a revelation.

She said right from the beginning that this is gonna be a barter.

Because were going to sing everything live,' he said.

And I thought, Wait, wait, what?

And she said, No, the only way this is going to work …

So that was terrifying, but I really relied on her.

I was also very interested in the character of Ally being a bit different than the other versions.

Shes not an ingenue; shes not this innocent person, he adds about his interpretation of Gagas character.

Youll be blown away by what [shes] created.

Allys rise has a musical arc to it.

I had the luxury of time.

A Star Is Bornis slated to hit theaters at the top of awards season on Oct. 5.

Read EWs full preview of the filmhere.