- Mother named her Liv after spotting actress Liv Ullmann on the cover of TV GUIDE.
- Grew up believing that singer Todd Rundgren was her father. Around age 10, she discovered that family friend Steven Tyler of Aerosmith was her biological father.
- Made her feature-film debut in 1994's Silent Fall.
- Appeared in Aerosmith's 1994 music video for "Crazy" alongside Alicia Silverstone.
- During the filming of Empire Records (1995), co-star Coyote Shivers was actually her stepfather – he was married to her mother Bebe Buell at the time.
- In 2003, became a spokesperson for Givenchy cosmetics; as part of that partnership, she recorded a cover version of INXS' "I Need You Tonight" in 2012.
- Released an etiquette book, co-written with her grandmother Dorothea Johnson, in 2013.
- 2004, Critics' Choice Awards — Best Acting Ensemble: Winner
- 2002, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- 2003, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Winner
- 2001, Screen Actors Guild Awards — Outstanding Performance by a Cast in a Motion Picture: Nominee
- Dave Gardner — Fiancé
- Lula Rose Gardner — Daughter
- Milo William Langdon — Son
- Royston Langdon — Husband (separated)
- Theo Wenner — Ex-significant Other
- Joaquin Phoenix — Ex-significant Other
- Bebe Buell — Mother
- Chelsea Anna Tyler — Half Sister
- Mia Tyler — Half Sister
- Sailor Gene Gardner — Son
- Taj Monroe Tyler — Half Brother
- Steven Tyler — Father
- Jim Wallerstein — Stepfather