An Olsen twin is down! An Olsen is down! Thankfully, according to the rep for the Mary-Kate half (the one on Weeds, as you surely recall) of Hollywood's richest set of formerly conjoined twins, the just-announced hospitalization was for a "kidney infection," an explanation far less suspicious than the "exhaustion" and "dehydration" excuses forever tainted by flacks for the actress's more-troubled, serially rehabbing peers. [People]