Left is Rachel Bilson and at the right is Selena Gomez. If you remember The O.C you should remember Rachel Bilson. Rachel Bilson played “Summer” in the 2003–2007 TV Series the O.C (Orange County, California). Selena Gomez who got her breakthrough in the Disney series Hannah Montana was recently seen in the tabloids, blogs and televison with her ex boyfriend Justin Bieber. Well even though Rachel Bilson and Selena Gomez are not the same age they certainly look alike.