United Kingdom, May 20 -- Jessica Biel thinks the "best thing" about being a mom is getting to play with her children.

The 42-year-old actress has Silias, nine, and three-year-old Finneas with 'Cry Me A River' singer Justin Timberlake, 43, and when asked by a little boy during PEOPLE's Kids Interview what the "best thing" about being a mother to two boys is, she noted that she has loved that she just loves being able to "have fun" with them both.

She said: "Oh my god, Kai! You're adorable. I have a nine-year-old son and a three-year-old son. The best thing about being a boy mom is playing. I think playing with my sons is the most fun. Wrestling, playing LEGO, building LEGO, swimming, playing sports, reading together.

"I love spending t...