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The singer picked up the best international female gong at the ceremony and admitted that she was overwhelmed.
"Oh my gawd. I'm SO happy. I've won a BRIT. That's like being knighted practically! Maybe even better. Thank you. Didn't expect THAT!" she wrote on her blog.
Shortly after collecting the award, the 'Hot 'N' Cold' star was forced to leave the event when she was violently sick backstage.
Perry added that she was still suffering from a temperature: "I can't tell you how bad I feel right now. Last night I was sweatin it out, but yeah, lets just say this kitty does not look so pretty right now.
"I have the doctor on speed dial if the fever gets over 101/102. I'm stuck in bed for the next couple of days as I should be. Im upset because Top Shop is right around the corner and I can't move outta my sweat bed. F-ing flu."
The singer is scheduled to play a trio of live shows in London and Manchester kicking off on February 24.
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