Hayley Kiyoko Alcroft (born April 3, 1991) is an American singer-songwriter, actress, and author. As a child model and actress, she appeared in a variety of films, including Lemonade Mouth (2011), Jem and the Holograms (2015), Insidious: Chapter 3 (2015), and XOXO (2016). Alongside her film roles, she also had recurring roles in the TV series  Wizards of Waverly Place (2010) and The Fosters (2014), as well as lead roles on CSI: Cyber (2015–2016) and Five Points (2018–2019).

Kiyoko issued three solo extended plays: A Belle to Remember (2013), This Side of Paradise(2015), which includes the single "Girls Like Girls", and Citrine (2016). Following the singles "Sleepover", "Feelings", and "Curious", she released her debut studio album, Expectations (2018), which reached the top 20 of the charts in the United States, Canada, and Australia. She has since released a fourth extended play, I'm Too Sensitive for This Shit (2020) and her second studio album Panorama (2022).

In 2023, Kiyoko released her debut novel, Girls Like Girls, published by Wednesday Books. The book debuted at number one on the New York Times Best Sellers list for Young Adult Hardcover and won the Goldie Award for Young Adult Fiction by the Golden Crown Literary Society. She has also created a comic book, with the help of Naomi Franquiz and Marla Vazquez, based on her song "Gravel to Tempo".

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