Jessica Biel has opened up about welcoming her "secret Covid baby" last year and has spoken about life as a family of four.

The actress, who shares sons Silas, 6, and Phineas, 11 months, with her husband Justin Timberlake, gave birth to her youngest son last summer, although the couple didn't confirm the news until January.

Speaking to Dax Shepard on his podcast Armchair Expert, Biel said of her life these days: "I'm spending a lot of time at home on Zooms in my apartment. Hanging with my baby, changing diapers, doing nap time."

She continued: "I had, like, a secret Covid baby. It wasn't like it was supposed to be a secret. It was just Covid happened, and then I went to Montana with my family and never left."

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The 39-year-old 7th Heaven star also spoke about her fears about giving birth during the coronavirus pandemic, saying she was worried that her husband wouldn't be able to be in the delivery room for her baby's birth.

"The hospital restrictions had just changed," she explained. "And there was a moment there that there was nobody allowed at all and I was really getting nervous about that situation.

"But yes, he was allowed. I think if I had to be there alone, that would have been horrible. I would have been really scared."

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Biel said they are loving life as a family of four but admitted it's "super hard".

"Someone said to me, 'Two is like having a thousand.' And that's exactly what it feels like," she shared. "The balance of everything is very different and super hard. But I agree. I mean, it's amazing. It's so interesting. It's so funny.

"The conversations I'm having now with my 6-year-old is so cool. Like, he's a real person saying the funniest stuff and he's so sensitive and tender. It's just so interesting to see that part of it happen and the little one is just cute as hell."

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The actress and producer also spoke about whether or not she wants her sons to follow in their parents' footsteps into showbusiness.

"My knee-jerk reaction is 'Oh god, no. Please no.'" she said candidly. "But then I look at these kids and I'm like, 'Oh s***, they're probably going to be musical. What are we going to do? Like, not let them play the piano or not let them take a voice lesson if that's their passion?

"I don't want to be that parent to stifle a dream. But man, if my kid would just be like, 'Let's go learn about corn in Iowa,' [I'd be like], 'Great.' I would so much rather them be an engineer or something."