- Was convinced by her sisters to start taking acting classes at the age of 8, joining the Australian Theatre for Young People, which boasts Nicole Kidman and Toni Collette among its alumni.
- Received her first film role at the age of 13, in the Australian comedy Dallas Doll (1994), starring Sandra Bernhard.
- Was awarded the Best Actress Award at the 2000 Venice Film Festival for her role in acclaimed Australian drama The Goddess of 1967.
- Made her first international screen appearance in 2002 with a small part as Queen Amidala's handmaiden, Dorme, in George Lucas' Star Wars: Episode II - Attack of the Clones.
- Did her own singing for her role as Jackie Q in 2010's Get Him to the Greek.
- Made People magazine's 2012 Most Beautiful list.
- 2010, Emmy — Outstanding Supporting Actress in a Drama Series: Nominee
- 2009, Emmy — Outstanding Supporting Actress in a Drama Series: Nominee
- 2007, Australian Film Institute Awards — International Award for Best Actress: Winner
- 2011, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- 2015, Critics' Choice Movie Awards — Best Actress in a Comedy: Nominee
- 2008, Golden Globe — Best Performance by an Actress in a Supporting Role in a Series, Miniseries or Motion Picture Made for Television: Nominee
- 2014, AACTA Awards — Trailblazer Award: Winner
- 2010, Golden Globe — Best Performance by an Actress in a Supporting Role in a Series, Miniseries or Motion Picture Made for Television: Nominee
- 2013, AACTA Awards — Best Lead Actress: Winner
- 2000, Venice Film Festival — Best Actress: Winner
- 2003, Australian Film Institute Awards — Best Actress in a Leading Role: Nominee
- 2009, Australian Film Institute Awards — International Award for Best Actress: Nominee
- Alice Byrne — Sister
- Bobby Cannavale — Significant Other
- Lucy Byrne — Sister
- Gregor Jordan — Ex-significant Other
- Rocco Robin Cannavale — Son
- Robin Byrne — Father
- George Byrne — Brother
- Brendan Cowell — Ex-significant Other
- Jane Byrne — Mother
- Attended University of Sydney, Sydney, New South Wales, Australia
- Birth Name: Mary Rose Byrne
- Birth Place: Sydney, New South Wales, Australia
- Profession: Actor
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