That blonde, Mark-Paul Gosselaar, is no slouch. He's a Cat 2 racer on both road and track. ;) He used to ride for Team Helen's, but I think he's with a San Diego team now.
http://www.pezcyclingnews.com/photos...paul-track.jpg
http://www.pezcyclingnews.com/photos...p-mpclimb2.jpg
As for celebs, a lot of them frequent Cynergy Cycles – a Specialized dealer.
It's kind of a no-win situation if they want to ride seriously. One big star (who shall remain nameless) wanted to join my club/team and there was quite a bit of opposition to it from the membership. No one wants to go on group rides with paparazzi cars swerving around them, blocking their path, or creating other dangerous situations.

