Will Smith and Jada Pinkett Smith got a visit from L.A. County Sheriff's deputies Monday, who were there to secure the property for a little lunch the Smiths are throwing for the First Lady of the U.S. of A.  Will, Jada and Salma Hayek are hosting the $2,500-a-head lunch for Michelle Obama this Thursday. That's the bargain basement price.  If people want their pic taken with Michelle Obama, the price of admission goes up to $10k a couple -- the good news, that includes lunch.  Several units from the Emergency Operations Bureau of the Sheriff's Dept. showed up to sweep the grounds ... inside and out.