Rachel Bilson is Sheer Madness

Rachel Bilson shows off her fit figure in a sheer blouse (by Lover) after visiting a casting office on Thursday afternoon in Los Feliz, Calif. The former O.C. actress treated herself to two Pinkberry smoothies before hopping in her car and driving home.

It also looks like Rachel dyed her hair a few shades lighter since we last saw her at the Independent Spirit Awards late last month. Looks perfecto!

Rachel, 25, ended her three-year relationship with The O.C. co-star Adam Brody, 27, back in December 2006.