Actress Demi Lovato and her younger sister Madison De La Garza enjoy a bike ride around Toluca Lake, California.
More photos of Demi Lovato and Madison De La Garza on their bicycles at Gossip Girls.
Fashion Designer Vivienne Westwood rides her bike for the premiere of "The Age of Stupid."
Read more about Vivienne at Riding Pretty.
Another kind of celebrity is a missing celebrity bike: a one of a kind GT Golden Zaskar that's supposed to be a traveling trophy. GT is offering a $3,000 reward for the return of this bike.
Finally, the San Francisco Bay Area Metropolitan Transportation Commission is taking nominations for bike commuter of the year. One "Bike Commuter of the Year" will be selected from each of the nine counties in the Bay Area.