Jaden Smith has described his famous dad Will Smith as a "walking dictionary" and says he can ask him anything.
The actors - who star together in new sci fi film After Earth - joined London Mayor Boris Johnson at a celebration for his Leadership Clubs, which offer extracurricular activities for 10 to 14-year-olds, during their visit to the capital.
The father and son arrived to the trailer of their new film with Jaden performing a spontaneous rap for the children.
He spoke about working with his father and said: "He has, as you can see, all the experience you ever need. So if you ever need anything on set, you can just walk over and ask him. He's like a walking dictionary.
"Any time I'm lost or anything, I can just ask him."
The 14-year-old actor and rapper named Shakespeare and Kanye West among his greatest influences and said he would never tell his father if he became more successful than him.
He said: "Even if I did it, I would never say it."
The pair joined in the children's activities, even making a "human knot" with them, where Smith joked: "I think I've pulled a muscle."
Will joked around with mayor Boris, who later revealed: "I was totally out of my depth there when we did the rapping stuff but it's fantastic, really wonderful Will and Jaden have given up their time to come here and electrify these kids.
"The idea is that leadership clubs are things that inspire you to do great things in your life. Maybe you're not going to be Will Smith and Jaden but everyone's got something fantastic in them."