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By Deborah Netburn, Los Angeles Times Staff Writer This past weekend Hollywoods richest, most beautiful and most exclusive sorority of ladies who can open a film -- let's call it Omega Mega Bucks -- welcomed a new member into its gleaming, wide-smiling ranks. Katherine Heigl had been an attractive rushee as Dr. Izzy Stevens on Greys Anatomy and a promising pledge when she starred as the gorgeous but vulnerable E! News anchor who helped push Knocked Up close to the $150-million mark this summer. But it wasnt until 27 Dresses (marketed almost entirely on Heigls personality) grossed $30 million in four days that Heigl passed the crucial initiation test: She opened a film successfully. That puts her in the same rarefied club as Reese Witherspoon, Julia Roberts, Kate Hudson, Drew Barrymore and just a few select others. Like all sororities, this exclusive group of women is in constant flux: There are alumnae who enjoyed the adoration of the masses for a time but then moved on to more adult (read: less mass appeal) pictures, those who joined but were eventually kicked out, and others who are desperately beating down the door to get in. Heres a look at Heigls peers, her role models and those she may someday mentor -- if she lasts long enough. After all, this group has something else in common with college campus sororities: Its vicious.
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