Jay Leno is sure mixing it up on his new TV show. Mike recently reported that The Jay Leno Show will feature a mash-up of musicians, and Leno's Green Car Challenge looks just as fun.

Drew Barrymore is the first star to accept a challenge to test her green driving skills during Leno's show. She'll get behind the wheel of a high-powered electric car on Sept. 19, facing off against another Hollywood racer.

Leno recently told Access Hollywood, "The fun thing about it, there's a lot of people ... perhaps athletes and people like this who are not good talkers but would be fun in this sort of environment -- to see if Shaquille O'Neal is faster than Cameron Diaz."

The stars are already lining up to participate, including Tom Cruise, who called Leno and asked if he could get in early and practice. Leno replied, "No, nobody gets to practice."

Sounds fun, though, doesn't it? Let's think of some dream pairings on the race track. How about: Julia Roberts vs. Mickey Rourke, Steve Carell vs. Quentin Tarantino, Robert Downey, Jr. vs. Meryl Streep ... Who would be YOUR dream racers facing off against each other?