Mischa Barton Designs For Humanity

Mischa Barton and her pet pooch Charles get together for another photo shoot at a park in Los Angeles on Wednesday.

For the full set of Mischa and her pup, visit PacificCoastNewsOnline.com.

Later in the evening, the 22-year-old former O.C. star worked the red carpet at the Billabong USA 2nd annual “Design For Humanity” charity event in Los Angeles.

The event included a custom Billabong bikini runway show featuring product collaboration pieces from Charlotte Ronson, Joy Bryant, Lisa Kline, Jenny Han, Cory Kennedy, and Amber Valleta (all one-of-a-kind bikini collaborations are up for auction on eBay). This year’s event benefited the Surfrider Foundation, which is dedicated to the protection and enjoyment of our world’s oceans, waves and beaches.