Actress Jessica Biel has finally opened up about her baby boy.

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The new mom, who gave birth last April, has been keeping quiet since she brought her son, Silas, into the world, but in an interview with E! News on Friday, she dished on what the most magical moment of being a mom is.

"Probably the moment he wakes up from a nap," she said. "He's sort of looking around and you sort of creep up and look over the crib and he looks up and he goes [sighing sound]. Just a gummy mouth, no teeth, just a big smile, happy that you're alive and you're just looking at him. That's probably the most magical."

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The actress admitted that there are some really emotional moments she has with her son, but there's a reason why that doesn't last long.

"You quickly move on from it because there is a dirty diaper in your palm," she said.

Biel also opened up on what it was like backstage at the Staples Center in Los Angeles where her husband, Justin Timberlake, performed with country-pop superstar Taylor Swift.

"It was super fun," the actress said. "We are fans of music from all walks of the spectrum, from country to rock to R&B, to hip hop, whatever. I'll pretty much see anyone live."

See more of Biel's interview in the video below.

Tags: Justin Timberlake Jessica Biel