Comedian Leigh Francis is one of the only celebs we know who never comes out of character. Seriously, whether it be the red carpet, the bar at the after-party or just a random visit to the heat office, you never get Leigh Francis. It's just Keith Lemon. Still, we're not complaining because Keith Lemon does crack us up. In the above clip we think he almost slips out of character at the end when he starts laughing. Have a watch and tell us what you think. To watch more exclusive behind-the-scenes videos, featuring famous faces such as Lee Ryan, Louie Spence, Lady Gaga, Jack and Ollie from Skins, Alex Reid and Dappy AND to be in with the chance of winning a slick Sony Ericsson Vivaz (TM) phone, just go to www.heatworld.com/vivaz