Bonnie Leigh McKee (born January 20, 1984) is an American singer and songwriter. Her debut album Trouble was released in 2004 by Reprise Records. After being dropped, she took a musical hiatus and established herself as a songwriter. She has written 10 singles that have reached number one in either the United States or the United Kingdom, which have sold more than 30 million copies worldwide combined. In 2013, she made a return to music with the single "American Girl". In 2015, she independently released the EP Bombastic.

In 2024, after 11 years of anticipation by her fans expressed on social media and internet forums, she released a rerecorded version of what was meant to be her second LP, Hot City, originally supposed to be released through Epic Records, but, after several delays, her label cancelled it. Right after the cancellation of her album, some tracks meant to be featured on it leaked on the internet, and since then have been cherished by her fans, prompting McKee to rerecord them, after getting inspired over the Taylor Swift masters dispute, then dropping several tracks originally meant for her shelved 2013 album as singles from mid-2023 to early 2024, and finally independently releasing the 16-track album on music streaming platforms.

McKee is particularly known for collaborating with singer Katy Perry. The duo wrote "California Gurls", "Teenage Dream", "Last Friday Night (T.G.I.F.)", "Part of Me", "Wide Awake", and "Roar". McKee also co-wrote "Dynamite" by Taio Cruz, which became the second-best-selling song by a British artist in the digital era. McKee co-wrote other songs including "Hold It Against Me" by Britney Spears and "C'Mon" by Kesha. She additionally has written for Cher, Christina Aguilera, Kelly Clarkson, and Adam Lambert. McKee also has collaborated with Canadian acapella singer Mike Tompkins.