From: www.nydailynews.com

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The reality TV star put her good looks on the line on Tuesday in a charity boxing match – and one female fan laid a blow right on Kim Kardashian's kisser, according to the U.K.'s Daily Mail.

The buxom beauty stepped into the ring dressed in head-to-toe pink Everlast gear, but she was soon bested by her opponent, who was the highest bidder in an auction benefiting The Dream Foundation at the Commerce Casino in Commerce, California.

"About to start boxing! In my physical! I'm sooo scared!!!!" Kardashian tweeted earlier in the day, also posting pix of herself getting her blood pressure checked before the bout.

But despite gamely facing her fears in the end, the 29-year-old socialite almost canceled her match after her younger brother, Rob, was KO'ed in an earlier fight.