Jessica Biel Reveals Her Favorite Part About Being a Boy Mom to Sons Phineas and Silas (Exclusive)

Jessica Biel is a proud boy mom.

While promoting her debut children's book, A Kids Book About Periods, the actress, 42, participated in PEOPLE's Kids Interview and was asked by kids about everything from her skincare routine to her favorite dress that she's worn this year. When asked about her favorite part about being a boy mom, the mom of two shared a sweet answer.

“Hi, Miss Jessica! I’m Kai, I’m 5. What’s the best thing about being a boy mom?” the little boy asks Biel in the video.

“Oh my God, Kai! You’re adorable. I have a 9-year-old son and a 3-year-old son. The best thing about being a boy mom is playing," Biel responds.

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"I think playing with my sons is the most fun. Wrestling, playing LEGO, building LEGO, swimming, playing sports, reading together. I love spending time with them, and I love getting down and dirty with them on the floor and just having fun. Not worrying about getting dirty or anything like that. I love that about being a boy mom."

Biel shares her sons Phineas, 3½, and Silas, 9, with husband Justin Timberlake.

In April, Biel shared a post on her Instagram, posing with her sons as they joined their musician dad on tour. Decked out in Timberlake's tour merch, the singer's boys struck a pose while Biel knelt and held a light-up microphone.

The proud mom also included a solo shot of her sons, who faced away from the camera while displaying their dad's concert shirts. In a third photo, Timberlake, 43, put an arm around his wife as they gazed into each other eyes backstage.

"It’s a family affair y’all," Biel wrote in her caption.

In February, Timberlake opened up in a candid moment on The Graham Norton Show about his family of four.

“I have two wonderful children, who are going to be the death of me,” Timberlake joked on the show. “But yeah two boys and a wonderful wife and I'm just happy," he said, playfully adding, "Is that controversial these days?”