Cathy Dennis is an English singer, songwriter, and record producer. While she had success as a pop artist in the early 1990s, Dennis became one of the most successful songwriters of the 21st century. She wrote Kylie Minogue's 'Can't Get You Out of My Head,' Britney Spears' 'Toxic,' and Katy Perry's 'I Kissed a Girl.' She was inducted into the Songwriters Hall of Fame in 2015.