Looks like more former world champions Formula One are getting on motorcycles. I don't think Niki Lauda really rides them seriously anymore (he prefers flying airplanes).
AP
Former Austrian Formula One champion Niki Lauda rides a motorbike on the catwalk during a fashion show of the underwear label Agent Provocateur at the opening of the 16th annual Life Ball in front of Vienna's city hall, Austria, on Saturday, May 17, 2008. The Life Ball is a charity gala where organizers raise money for people living with HIV and AIDS. (AP Photo/Ronald Zak)
really rides them seriously anymore (he prefers flying airplanes). 
