I bet you were thinking what I was thinking when you read the topic title like I did.... But no, Will Smith did actually kiss his son Jaden like that, he was trying to prove a point about their at home relationship as father and son and show that even though they are a celeb family, Will can be embarrassing like other dads.
Jaden was during an interview in Thailand when it happen. He jumped out the chair laughing and then stated "this is ridiculous." Watch the video below.