James Marsden & Jeremy Sisto: Nautica Malibu Triathlon 2013!

James Marsden flashes a smile as he participates in the 2013 Nautica Malibu Triathlon on Sunday (September 8) in Malibu, Calif.

The 39-year-old actor was joined by Suburgatory stars Jeremy Sisto and Parker Young at the event raising funds for the Children’s Hospital Los Angeles’ Pediatric Cancer Research Program.

PHOTOS: Check out the latest pics of James Marsden

The triathlon, presented by Equinox, was divided into two races, with the Classic Distance Race consisting of a half-mile swim, 18-mile bike ride and four-mile run.

10+ pictures inside of James Marsden and others at the 2013 Nautica Malibu Triathlon…