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Jada Pinkett Smith realized her star son Jaden Smith lost his virginity because he had a “certain swag” about him.

“He was walking different, and there was just a loss of this … my little boy was gone,” she said on NBC’s “Megyn Kelly Today.”

“And 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.’ ”

The “Gotham” actress said her now-19-year-old even ’fessed up.

“I said, ‘Oh, OK, anything you want to tell me?’ And right away [he told me] — Jaden can’t lie.”

Pinkett Smith recently revealed that Jaden, her son with Hollywood icon Will Smith, moved out at just 15.