Will Smith and Tom Cruise have autograph signing competitions.

'Hancock' star Smith has revealed he and his close friend always try to outdo each other by each trying to spend more time with their fans on the red carpet than the other.

Smith said: "It's hard to beat that dude. He has another gear. He did two-and-a-half hours in France for 'Mission: Impossible' on the red carpet. Now when I go to France, people will say: 'You know, Tom was out here for over two-and-a-half hours.' "

The 39-year-old actor also revealed playing boxing legend Mohammad Ali in the 2001 hit 'Ali' inspired him to have more confidence in himself.

Smith — whose performance earned him an Oscar nomination — explained: "When I was doing 'Ali', I realised that he kept saying: 'I'm the greatest, I'm pretty,' to make himself believe it. He doesn't believe it, but he was dealing with racism. He was reacting to pain and rejection. He said it so much that he started to really believe it. That is what I've tried to do for myself."