Rachel Bilson Strikes a Posen

Budding fashionista Rachel Bilson sits front and center at the Zac Posen Fall 2007 fashion show during Fashion Week at The Promenade in NYC’s Bryant Park on Thursday night. Rachel sat right beside Rihanna (below), Joel Madden, and Nicole Richie. More pictures after the jump!

Rachel, 25, and Zac, 26, also kicked back and celebrated his collection at an after party at midtown restaurant Amalia.