It looks like Jay Leno's (search) celebrity-autographed motorcycle (search) has raised nearly a half-million dollars for victims of Hurricane Katrina (search).

Bidding for the bike closed on the eBay auction Web site at 5 p.m. Thursday, and Leno announced during the taping of Thursday's "Tonight Show" that the winning bid was $505,100. Ninety-five percent of the winning bid will be donated to the American Red Cross for Katrina relief efforts.

For the past four weeks, "Tonight Show" guests and surprise arrivals have been autographing the Harley-Davidson motorcycle. The final signers on Thursday were guests Matthew McConaughey and Angie Harmon and surprise walk-ons Jimmy Smits and Jennifer Love Hewitt.

Previous signers include Gov. Arnold Schwarzenegger, Billy Crystal, Reese Witherspoon, Adam Sandler, Jennifer Garner and Pamela Anderson