Rachel Bilson, I'm Your Biggest Fan!

Rachel Bilson joins fiance Hayden Christensen watch the men’s semifinals at the 2009 U.S. Open at the USTA Billie Jean King National Tennis Center on Sunday (September 13) in the Flushing, Queen, New York City.

The 28-year-old actress blocked the sunlight with a hand fan that read, “I’m Your Biggest Fan.”

Earlier in the day, Rachel sat front row next to Nicky Hilton and 90210‘s Shenae Grimes at the Jill Stuart Spring 2010 fashion show held at The New York Public Library. Stuart even met up with Bilson backstage (pictured below)!

FYI: Rachel is wearing shoes by Giuseppe Zanotti Design.

10+ pictures inside of Rachel Bilson‘s biggest fan…