- Daughter of Peter Watts, sound engineer for Pink Floyd until 1974.
- Best friends with Nicole Kidman, since a casting call for commercial when they were girls.
- Moved to Australia when she was 14.
- Is a vegetarian.
- She once appeared in an Australian television commercial turning down a date with Tom Cruise for her mom’s lamb roast.
- Was named one of the 50 Most Beautiful People by People Magazine in 2002.
- She has a brother named Ben, who is a photographer.
- Featured on the cover of the Australian Empire Magazine March 2003 for Women of the Year 2002.
- Voted the 14th Sexiest Female Movie Star in the Australian Empire Magazine September 2002.
- When her cell phone rings, it plays Pink Floyd’s “Money”.
- Her father died when she was seven.
- Accepted the role for 21 Grams (2003) without reading the script first.
- She met Heath Ledger on the set of new historical epic Ned Kelly (2003), and the pair dated until May 2004. He accompanied her to the 2004 Oscars Ceremony.
- She has a Yorkshire Terrier named Bob.
- Her favorite actresses are Meryl Streep, Jodie Foster and Julianne Moore. For music, her favorite artists/bands are Fiona Apple, Coldplay, Björk, Radiohead, Cat Stevens and Pink Floyd.
- Moved in with best friend Nicole Kidman after Kidman spilt up from husband Tom Cruise.
- Her father was a sound engineer for Pink Floyd.
- Favorite comfort food are baked beans.
- Director David Lynch asked her to be in the movie Mulholland Dr. (2001) after picking out her headshot from a stack of actors.
- Ended relationship with Heath Ledger (May 2004).
- Favorite sports to watch are soccer, boxing, and tennis.