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Generation Rx sounded pretty cool when the term was first coined, but now that Paris Hilton, Nicole Richie, Britney and Lindsay have all boarded the Adderall bandwagon, we fear the pill-popping twenty-something crowd has officially snorted the shark. According to reports in both the New York Daily News and on, crushing the little blue pills and snorting them is the oh-so-coolest way to stay skinny, replacing old time faves caffeine, cigs and (if you're adventurous) cocaine. But just as we started hating on all the celebs using the pill-of-the-week to lose weight, we read a bit more about who else in Hollywood is hooked on the jitterbuggy meds. After the jump, learn which highest of highbrow actresses is also suspected of Adderall addiction:

From a nutrition expert at Berkeley quoted in ABC's piece: "I watched Atonement last night and thought that Keira Knightley looked like she was a refugee from a concentration camp." Um, zing? While the nutrition expert's assertion is far from scientific, and while we concur that anything the members of the Bimbo Summit do is officially trashy, we must admit we're not sure what to make of the news that a British blueblood lass like Keira has (allegedly) joined Gen Rx. Just watch, next thing we know she'll be swinging from the chandeliers at the Chateau Marmont while a giddy Pete Doherty looks on. Say it ain't so, Keira!