In a surreal collision of Hollywood’s most infamous true-crime eras, Kato Kaelin was spotted outside the Brentwood estate where legendary director Rob Reiner and his wife, Michele Singer Reiner, were found brutally murdered last week. Kaelin, who became a household name as the shaggy-haired houseguest during the 1995 O.J. Simpson trial, was seen standing in front of the Reiner’s gate Monday — near the same tree-lined streets that once served as the backdrop for the trial of the century.