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The web-enabled stalkerazzi at staked out Hollywood Boulevard, and after untold man-hours spent monitoring the comings and going of clubgoers, have finally blown the lid off one of the nightlife industry's dirtiest and best-kept secrets: Underage celebrities frequent establishments where alcohol is served. In addition to a (shocking!) photo of 18-year-old Jesse McCartney clutching a Corona (likely alcohol content: 4.5 percent), the site has (jaw-dropping!) video of some of your favorite teen stars brazenly patronizing bars:

TMZ has video of other underage stars entering and leaving Mood — 19-year-old Mary-Kate Olsen, 19-year-old Lindsay Lohan, 20-year-old Frankie Muniz, and the list goes on, though we don't know what they did when they were inside. How do they get away with it? A Hollywood nightclub promoter, who asked to remain anonymous, was blunt: "Authorities know that there are underage celebrities inside drinking and if they don't care, why should we?" He added the obvious: "Celebrities help to make our clubs more exclusive.

Indeed, local nightclubs couldn't possibly achieve any kind of B-list cred without the possibility that one might experience the mind-melting cognitive dissonance of watching Malcolm in the Middle's boy genius sucking tequila out of a shot girl's navel. Even so, the responsible citizens of TMZ have alerted the Alcohol Beverage Control department about the clubs' permissive shenanigans; we expect a full investigation (complete with undercover infiltration of the club scene performed by a plea-bargaining pigeon from a WB drama), and that the secret scourge of underage celebrity patronage will be wiped out by the end of the month.