"Dancing with the Stars" can take a toll on the contestants. Now Kathy Ireland has revealed the secret pain she's been suffering since doing the show!

Taking to her Twitter account, Kathy states: "...the truth is, after my little spin on DWTS I'm going to have knee surgery."

She adds that the reason she kept her pain a secret was because she didn't want pity. "Did not want people to know during voting process because sympathy votes and drama are not my thing," she writes.

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