Jada Pinkett Smith knew when her son lost his virginity because of his newfound ''swag''.

The 46-year-old actress has revealed her son Jaden, 19, didn't have to tell her when he'd had sex for the first time, as she could immediately tell her ''little boy was gone'' by the new sense of confidence he had after the act.

Jada - who also has 17-year-old daughter Willow with her husband Will Smith - said: ''There's just a certain swag, there is. He was walking different, and there was just a loss of this - my little boy was gone. My little boy was gone. I looked at him and I was like, 'Where have you been? What's been going on?' And he said, 'You know, I was just with a friend.' And I said, 'Oh, okay, anything you want to tell me?' And right away [he told me] because Jaden can't lie.''

The 'Girls Trip' star isn't shy when it comes to spilling truths about her family, and even admitted that her pregnancy with Jaden was a ''challenge'' because her first tot ''wasn't planned''.

She said: ''Jaden was a surprise. He wasn't planned ... so my life changed quickly. There was a lot of adjustment to make. At that particular time, Will's career was just taking off and somebody has to hold the fort down at home. It was very challenging and trying to figure out who I was supposed to be in this new life.''

But as always, her 49-year-old spouse was on hand to support the 'Red Table Talk' host through it all.

Speaking during an appearance on 'Megyn Kelly Today', Jada said: ''We have a very, very, very, unique partnership. And it's really great because when you get to a place where you can love someone and allow them to be exactly who they are ... through my journey, [I have] learned to love him in the most pure way and love everything that comes with that and he's learning to do the same.''