Chad proposed to Sophia Bush while they were filming the movie The House of Wax. He even asked her parents before he proposed. He used colored light bulbs to spell out, 'Will you marry me?' The engagement ring was a rare Australian pink and blue diamond. The couple married on April 16, 2005 in Santa Monica. They separated in October 2005 after only five months of marriage when Chad admitted to Sophia that he had cheated on her. In the divorce papers Sophia cited "Fraud" as the reason for anullment. Although Chad was upset about the break-up, he was determined to make things work on the set of One Tree Hill. While they were together, Chad said about Sophia, "She makes me a better man--and a little bit neater--and she's a phenomenal best friend."