TWIN PEAKS star Kyle MacLachlan has discovered one of the secrets of lifestyle queen Martha Stewart's daily talk show - she never lets celebrity guest cooks handle knives. The actor swears fans of the show will never see a star cutting up anything on the show because producers fear the guests will get too nervous trying to chop and chat at the same time - and slice off a finger. MACLachlan stumbled across the secret when he recently appeared on MARTHA and wasn't allowed to chop up his own food. He reveals, "I've got a salad dressing that I make but they didn't want me to have a knife in my hands on television, just in case I got too nervous."