NASCAR superstars Jeff Gordon, Tony Stewart and Kasey Kahne raced go-karts at Slideways in Knoxville, Tenn., on Wednesday afternoon.

There was only minimal bumping and it was all for a very good cause.

The event helped raise money for Gordon's Kick It charity, which raises money to help children fight cancer. The charity has raised more than $3.3 million for the cause to date, and anyone wishing to add to that total can click here.

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Gordon and Kahne obviously enjoyed mixing it up on the track, as Gordon posted an account of their encounter on Twitter, along with several other posts throughout the successful fund-raising day.

In the end, Kahne emerged with bragging rights.