"Ryder's like, 'Mom, you're cramping my style,'" she laughed. "But when I did it, he was like, 'Oh my God, we actually ...' It was the first time he even could see that we looked, you know, that he looked like his mommy."
And they're still sharing hair inspiration. "Now it's starting to grow out, and Ryder's growing his out," she said.
ET was with the actress and her co-star, Sterling K. Brown, in New York, talking about their new film Marshall, in theaters October 13th. Hudson still has her long blonde locks in the film, but right now, she's enjoying the low maintenance look.
"I like the ease of it, you know what I mean?," she said. "When I looked at the hair when it came off I was like you know this is...I'm so happy this is gone. It was a lot of wear and tear on that."
The star, long an icon for her golden mane, isn't one to be defined by a single look, especially when it comes to acting.
"I think that when you choose to be an actor, you choose to be an actor to play roles that mean that you shift things," she said. "And there's no preciousness to, like, what other people would see as something that they identify with you as. When you're an actor, you sort of want to identify with different characters and different roles."
"You can get caught up in the fact that, 'Oh no, what happens if the identity that people see me as is like gone?' I just don't care, I just don't think about stuff like that so, for me, I was just excited to get rid of all the old hair."
For more on her shaved style, watch the video below!