Will Smith punched Charlize Theron in the face when they first worked together. The actor was preparing to portray legendary boxer Muhammad Ali when he starred alongside the blonde beauty in 2000's "The Legend of Bagger Vance" - and got carried away showing off his fighting skills.

Charlize said: "The first time I worked with him he punched me in the face. He was training for 'Ali.' I encouraged him to show me a couple of moves. I was completely knocked out!"

Will Smith has contacted the original "Karate Kid" for advice on his remake of the iconic film. The 40-year-old star - whose 10-year-old son Jayden is set to star in the film - is a producer on the venture, and was keen to get some tips from Ralph Macchio.

Ralph, who played Daniel LaRusso in the 1984 film, said: "It was very cool. He called and said, 'Would you mind getting on the phone with my son?' I felt like Yoda speaking to a young Luke Skywalker, you know, from the 'Star Wars' movies."

Charlize Theron is sick of being linked with "doom and gloom." The South African-born actress - who played a serial killer in "Monster" and a mine worker who was sexually harassed in "North Country" - accepts her most famous movies have involved depressing storylines.

Charlize - who portrays a woman with a troubled childhood in new movie "The Burning Plain" - said: "I am starting to figure that if there is a woman in a doom and gloom scenario, my name comes up."

Will Smith wants to play Barack Obama in a film. The 40-year-old actor admits he would be unable to say no if the U.S. President-Elect asked him to take on the role.

He said: "If I'm ordered by my Commander-In-Chief to star in the film, then I'll do my duty as an American."

Will Smith thinks it's "crazy" that people like his movies. The actor - who was in London for the U.K. premiere of his new movie "Seven Pounds" Wednesday night - confessed he was overwhelmed by the response from his fans.

He told BANG Showbiz: "To me, that's how I judge the quality of the material by how people are responding to it. People work hard for their money and then on a Friday night they go to the movie theater and decide where they're going to put it, and a lot of the time they choose my movies over a lot of other movies. So I think that's very, very crazy."