Olivia Wilde may be expecting her first child with fiancee Jason Sudeikis, but back in 2004 she was playing Seth Cohen's bi-sexual girlfriend, Alex, on The OC.
She was totally kickass, had a butterfly tattoo, purple in her hair and regularly rocked fishnet tights. We didn't even mind when she ditched Seth and shacked up with Marissa, because she was so bloomin' cool.