Actor George Clooney walks onstage wearing a surgical mask and gloves after finding out that host Jay Leno of the 'Tonight Show' was fighting a cold December 8, 2005 in Burbank, California.

Actor George Clooney walks onstage wearing a surgical mask and gloves after finding out that host Jay Leno of the 'Tonight Show' was fighting a cold December 8, 2005 in Burbank, California.

In this NBC Entertainment handout, 'Tonight Show with Jay Leno' host Jay Leno stands next to a Harley-Davidson motorcycle January 3, 2005 in Burbank California. Leno annouced on the show the he would partner with Harley-Davidson to raise funds for victims of the Indian Ocean tsunami. Leno will have guests sign the motorcycle and then auction it off.

In this NBC Entertainment handout, 'Tonight Show with Jay Leno' host Jay Leno stands next to a Harley-Davidson motorcycle January 3, 2005 in Burbank California. Leno annouced on the show the he would partner with Harley-Davidson to raise funds for victims of the Indian Ocean tsunami. Leno will have guests sign the motorcycle and then auction it off.

'Tonight Show' host Jay Leno (L) and actor Charlie Sheen shake hands on the set of the show after signing a Harley-Davidson motorcycle that Leno is using to raise money for the victims of Hurricane Katrina at NBC studios September 6, 2005 in Burbank, California. Leno is having celebrity guests sign the motorcycle, which will be auctioned on eBay September 19. Harley-Davidson donated the bike.

'Tonight Show' host Jay Leno (L) and actor Charlie Sheen shake hands on the set of the show after signing a Harley-Davidson motorcycle that Leno is using to raise money for the victims of Hurricane Katrina at NBC studios September 6, 2005 in Burbank, California. Leno is having celebrity guests sign the motorcycle, which will be auctioned on eBay September 19. Harley-Davidson donated the bike.

'Crocodile Hunter' Steve Irwin appears on 'The Tonight Show with Jay Leno' at the NBC Studios on November 6, 2003 in Burbank, California.

'Crocodile Hunter' Steve Irwin appears on 'The Tonight Show with Jay Leno' at the NBC Studios on November 6, 2003 in Burbank, California.

Actor Pierce Brosnan (right) and singer Janet Jackson (left) appear on 'The Tonight Show with Jay Leno' on April 29, 2004 at the NBC Studios, in Burbank, California.

Actor Pierce Brosnan (right) and singer Janet Jackson (left) appear on 'The Tonight Show with Jay Leno' on April 29, 2004 at the NBC Studios, in Burbank, California.

Singer Dolly Parton appears on 'The Tonight Show with Jay Leno' at the NBC Studios on October 9, 2003 in Burbank, California.

Singer Dolly Parton appears on 'The Tonight Show with Jay Leno' at the NBC Studios on October 9, 2003 in Burbank, California.

Comedian Jay Leno gets a make-over from the cast of 'Queer Eye for the Straight Guy' backstage on the Tonight Show with Jay Leno at NBC Studios, August 14, 2003 in Burbank, California.

Comedian Jay Leno gets a make-over from the cast of 'Queer Eye for the Straight Guy' backstage on the Tonight Show with Jay Leno at NBC Studios, August 14, 2003 in Burbank, California.

Comedian Jay Leno is photographed in his Big Dog Garage which houses his extensive and historical collection of cars and motorcycles for Los Angeles Times on October 2, 2015 in Burbank, California....

Comedian Jay Leno is photographed in his Big Dog Garage which houses his extensive and historical collection of cars and motorcycles for Los Angeles Times on October 2, 2015 in Burbank, California....

Actor Jim Carrey appears on 'The Tonight Show with Jay Leno' at the NBC Studios on May 15, 2003 in Burbank, California.

Actor Jim Carrey appears on 'The Tonight Show with Jay Leno' at the NBC Studios on May 15, 2003 in Burbank, California.

Jay Leno and Hilary Duff during Hilary Duff Visits 'The Tonight Show with Jay Leno' - June 13, 2005 at NBC Studios in Burbank, California, United States.

Jay Leno and Hilary Duff during Hilary Duff Visits 'The Tonight Show with Jay Leno' - June 13, 2005 at NBC Studios in Burbank, California, United States.

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