Christian Bale's daughter wasn't impressed that he sang with Taylor Swift in 'Amsterdam': 'Why would you do that?'

October is shaping up to be an important month for the Swifties. Taylor Swift's 10th studio album, "Midnights," is out October 21, and the songwriter returns to the big screen with a supporting role in David O. Russell's "Amsterdam." She is part of a star-studded cast that includes Christian Bale, Margot Robbie, Rami Malek, Robert De Niro and Chris Rock, to name a few.

Swift's musical talents are on display in a memorable scene where she sings with Christian Bale, an experience that clearly impressed the 'American Hustle' star. In a new interview with , Bale opened up about his excitement to sing with Swift and his family's reaction to the news.

"It was a really nice surprise, and I didn't tell anyone about it until afterwards," Bale said. "I went to my daughter and said, 'Do you know who I sang with today? Taylor Swift." And she was like, "Wait, what? Why would you you?"

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Bale was doing this because his character from Amsterdam, Burt Berendsen, has a lifelong passion for music and enjoys singing a capella with his army buddies Harold Woodman (John David Washington) and Valerie Voze (Margot Robbie ).

"It was a really funny scene, actually, because J.D. and I had practiced that song a bit," Bale said. "David made us sing it all day, but there were times when I would forget the lyrics. So I would look at J.D., he would look at me and then he would forget too. So, I would have to tell him. And then we We were going flat. Our pitch was all over the place, but we were like, 'Yeah, but the feeling is good!'"

Eventually, the director stepped in and decided that the only person in the scene who was actually a professional musician should sing.

"And then all of a sudden David just goes, 'What if Christian and J.D. shut up about this one and let Taylor do it?' Bale said, "And it was like we drowned out an angel's voice all day with our cacophony and our rough, terrible voices. So it's really something when you have someone with a voice as beautiful as his singing right next to you. Oh man, that was phenomenal."

“Amsterdam” hits theaters on Friday, October 7.

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