- Just like his characters Billy Kennedy (Neighbours (1985)) and Robert Chase (House (2004)), his real-life father and brothers are all doctors.
- Was engaged to House (2004) co-star Jennifer Morrison. The engagement ended August 15, 2007.
- Former roommate of James McAvoy when he lived in London. The latter invited him to the Los Angeles premiere of The Last King of Scotland (2006).
- Has played the violin since the age of 10.
- Is fluent in French.
- He was in the Australian Boys Choir.
- Sang the song "Molly Smiles" on the Uptown Girls (2003) soundtrack.
- Plays the guitar, the bass, and the piano.
- Has two older brothers and a younger sister.
- 2007: In People's 100 Most Beautiful People issue.
- Unveiled an Uptown Girls (2003) window display in New York with co-stars Brittany Murphy and Dakota Fanning.
- Now resides in Los Angeles. He used to live in Chicago when he filmed Chicago Fire.
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