A slimmer Tara Reid shops at Stuart Weitzman in Beverly Hills yesterday. Tara Reid is attached to star in and executive produce the indie romantic comedy Honestly,” the story of “a hard-boiled private eye who works as a temptress to test the fidelity of philandering husbands” (and then, of course, eventually falls for her mistress-diddling quarry) . Even more touching: It’s being directed by her brother.