Kim stepped inside the ring with a female fan on Tuesday for a celebrity-boxing match at Commerce Casino in Commerce, Calif. but the fearless star got more than what she bargained for.

Kim eventually went down–but not without a good fight. The fan won the right to fight Kim as part of an auction for charity that would benefit The Dream Foundation.

Right before she stepped into the ring Kim took to her twitter page to let fans know how anxious she was.

“About to start boxing! In my physical! I’m sooo scared!!!!” she tweeted.

Kim was the only sister brave enough to get in the ring, but her brother Robert Kardashian and step dad Bruce Jenner also went down–in the name of charity.

Kim’s fight almost didn’t happen because Robert took a bad beating right before her. His opponent was much larger than him, which was against the original rules.

Kim eventually jumped into her brother’s corner and demanded the fight was stopped after the first round. The family then went backstage for almost an hour before Kim put on a brave face and came out for her own fight.

She certainly gives new meaning to the word knockout! How much would you pay for a friendly boxing match with Kim Kardashian? Click here to view candids of the Kardashians arriving at the event!

Source: Hollyscoop.com