Austin Nichols and Sophia Bush struck up a relationship in 2010, but before that, Nichols already knew how much chemistry he had with Bush. In 2009, when he was offered a regular role on "One Tree Hill," he told the series creator that he would only agree to do so if his character got on with Bush.

"When Mark asked me to come back as a series regular I told him I only would if we could make a really powerful love story for Brooke and Julian," he explained to examiner.com (via MTV). "I wanted him to give them the greatest love story. I mentioned 'The Notebook' to him. I wanted him to give them that kind of love and story, a fountainhead love. And in 'The Notebook' even when they fight, it's how it is now for Brooke and Julian, it's fun to watch them fight. It's sexy. It's inspiring."

Bush seemed to appreciate Nichols' decision to be a series regular because of her. "We've been dating off and on for the past four years. We had so many years of history prior to him coming to work on the show," Bush told E! News in 2010. "And I think someone taking a job and moving their life across the country to show you how much they care is pretty much the most romantic gesture that a person could make."

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