Blake Lively joins jewelry designer Lorraine Schwartz for a tennis match during the 2011 US Open held at the USTA Billie Jean King National Tennis Center on Monday (September 5) in Flushing, New York.

The 24-year-old Gossip Girl actress watched Serena Williams of the United States face off against Ana Ivanovic of Serbia during Day Eight of the tennis tournament. Serena won in straight sets — 6-3, 6-4.

Also in attendance at the US Open: Ciara and Spike Lee.

10+ pictures inside of Blake Lively and Lorraine Schwartz at the US Open…