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Her boobs were digitally toned down to appear smaller in the official poster for the 5 December (10) concert.
A source tells UsMagazine.com, "Her team thought her boobs looked too big."
It's not the first time Perry's breasts have caused her problems - Sesame Street bosses were forced to axe her performance of Hot N Cold last month (Oct10) on the kids show when parents complained about her busty look.