One Tree Hill Sweethearts Sophia Bush, Austin Nichols Split

Willa Holland The O.C. alum Willa Holland has been cast in the CW pilot Arrow, Deadline reports. Pilot Season: Melrose Place's Katie Cassidy lands female lead in CW's Arrow Arrow, based on the DC comics character Green Arrow, stars Stephen Amell as a superhero who fights crimes using archery and martial arts. Arrow's alias is the wealthy playboy-turned-politician Oliver Queen. Holland will play Queen's bratty younger sister Thea. Gossip Girl's Katie Cassidy was cast earlier this week as the female lead. Check out all the latest pilot news Arrow will be executive-produced by Brothers & Sisters' Greg Berlanti, Marc Guggenheim and The Vampire Diaries' Andrew Kreisberg.