Scarlett Johansson shares son Cosmo's favorite song in rare moment

Scarlett Johansson shared a rare piece of information about her son, Cosmo, 3.

Scarlett, who welcomed Cosmo with husband Colin Jost, spoke about the kid while attending the London premiere of Jurassic World Rebirth on Tuesday.

When asked about her son’s preference in music, the Black Widow star told MTV UK, "I mean, my son's favorite Chappell song is H-O-T T-O G-O, 'HOT TO GO!,' And I don’t know if it’s my favorite, but because he sings it, it has become my favorite."

The Other Boleyn Girl star is also mom to daughter Rose Dorothy, whom she welcomed with ex-husband Romain Dauriac.

Scarlett rarely shares information about her kids and believes in preserving their privacy as long as possible. In March, she told InStyle that fame is a burden to carry, and she wants her kids to have the choice to remain away from the spotlight.

"But if anyone knows me, I definitely over-share. I'm not a closed book, you know?" she noted. "I'm politically active and vocal about it. But I am a private person in the sense that I value my close friendships. My family is very precious to me, as is their privacy."

"The anonymity of my children is very precious to me. I was talking to my daughter the other day, because she said, ‘Oh, I would love to make videos for The Outset,' She was like, ‘Why can't I?’ And I said, ‘Well, other than the fact that you're 10…’ "

“The thing about being a public figure is that the idea of being recognizable and celebrated feels fun, but then you can never stuff it back in the bottle," she explained.

Scarlett Johansson added, "The reality of it is, there’s a massive loss to that, you know? So I think preserving that for as long as possible until it’s someone's choice, that’s the choice I make as far as my kids go.”