- Sings and plays piano for the rock band Paramore.
- Her favourite movies are: Wayne's World (1992), Son in Law (1993), Pet Sematary (1989), True Romance (1993).
- In 2009, she won Spin Magazines' Readers Poll: 'Sex Goddess Of The Year'.
- In 2009, and 2010, she won Kerrang Readers' Poll award in the category of "Sexiest Female".
- Recorded her first song at the age of 15.
- Has two younger sisters: Erica and Mckayla.
- In 2014, Hayley had noted that she was working on releasing her own brand of hair dye.
- She has a tattoo of a cross on her right thigh.
- Williams has said that her favorite bands include Saves The Day, mewithoutYou, Slick Shoes, The Chariot, Now Now Every Children, No Doubt, Fireworks, Set Your Goals, Tegan and Sara, New Found Glory, H2O, Lemuria, and The Swellers.
- She has a tattoo on the inside of her right ankle saying "Shave Me" to commemorate her time on Warped Tour.
- She was discovered in 2003 by managers Dave Steunebrink and Richard Williams who signed the 14-year-old to a production deal.
- She had five tattoos: one behind her ear, two on her ankle, one on her thigh, and one on her wrist. The number of tattoos increased to a total of 9 after couple of months.
- Williams is good friends with fellow artists such as Brandi Cyrus, Miley Cyrus, Taylor Swift, and several other not well-known bands, such as Fun, and The Swellers.
- While still in school, she tried out for a local funk cover band called The Factory, where she met bassist Jeremy Davis.
- Her parents are named Christie Williams and Joey Williams.
- Was in a 3-year relationship with Josh Farro, former guitarist of the band Paramore.
- In 2010, she appeared on the tracks "Airplanes" and "Airplanes (Part II)" from alternative rapper B.o.B's debut album, B.o.B Presents: The Adventures of Bobby Ray.
- Her parents divorced when she was age 7.
- Was in a relationship with Chad Gilbert [2008-2017].
- Her touring hairdresser is named Brian O'Connor.
- (July 1, 2017) Has filed for divorce from her husband of 16 months Chad Gilbert after 9 years together in total.
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