Will Smith and son Jaden surprise City Hall children
25 May 2013 Last updated at 00:50 BST
Schoolchildren gathered for an event at London's City Hall were surprised when Hollywood star Will Smith and his son Jaden walked in to speak to them.
The children were at the venue for the mayor's Leadership Clubs programme, which offer extra-curricular activities for 10 to 14-year-olds.
BBC London's Entertainment Correspondent Brenda Emmanus spoke to the father-son duo and "shocked" Sebright School pupil Albert Andrew.