Click to viewIt's shaping up as a cruel summer for drunk, high or otherwise messed up celebrities trying to stay on the straight and narrow. Comedian Andy Dick was arrested this week for groping a 17-year-old's breasts while in possession of marijuana and Valium, in something of a reprise of his bust last year for doing blow in a nightclub. Actress and teen rehab veteran Drew Barrymore is now reported to have boozed her way to a breakup with actor Justin Long. Heather Locklear fled "depression and anxiety" rehab in Arizona after barely two weeks. Even a Rolling Stone, Ronnie Wood, surrendered himself to rehab again after leaving his wife for a 19-year-old cocktail waitress — and two bottles of vodka per day. Maybe all that summer daylight is pushing everyone over the edge! In any case, it's tough to keep track of who's where on the customary arc of high-profile substance abuse: embarrassment, criminality, rock-bottom desperation, rehabilitation and then either another trip around the circle or a break into the freedom of sobriety. That's why we've compiled a guide to once and future inebriated celebrities: 20 actors, singers, models and socialites who hog way more than their fair share of space in the gossip pages — and here on Gawker. We'll update and expand this list over time as a sort of encyclopedia of shame; your comments and tips are encouraged. (The arrows, by the way, indicate trends in drunkenness, so an upward arrow means getting drunker, downward means getting more sober.)