At 16 years of age, Hazell left school to work as a hairdresser. Her work colleagues persuaded her to try her luck at modelling. At 17, she competed in The Daily Star’s “Search for a Beach Babe” contest and won. Still not old enough to pose on Page 3, she went to study fashion at Lewisham College. But later, a friend told her about The Sun’s Page 3 Idol competition. Despite some initial uncertainty about entering the contest, she submitted some photos. She was eventually chosen the winner in December 2004. She won £10,000 worth of “sexy clothes” and “a one-year membership of the Rex cinema and bar”. Another part of Hazell’s Page 3 Idol win was a one-year exclusive glamour modelling contract with The Sun.
Hazell was regularly featured in Nuts, Zoo and continues to appear in The Sun at least once a month. She has been on the cover of The Sun’s 2006 and 2007 Page 3 calendars, in addition to her own wall calendars, the 2007 edition selling 30,000 copies in its first few days of release.
In 2009, according to the August edition of Loaded, Peta Todd states that Keeley has given modelling up to pursue a career in acting. She also stated that Keeley is currently in America receiving acting lessons.