Alexandra Imelda Cecelia Ewen Burke is an English singer, songwriter and actress. She won the fifth series of the talent television show The X Factor in 2008. Following the show, she was signed to Syco Music and released the winner's single "Hallelujah", which became the European record holder for the most singles sold over a period of 24 hours, selling 105,000 in one day, and became the top-selling single of 2008 in the UK and the UK's Christmas 2008 number one.

The X Factor is a British television music competition to find new singing talent. The fifth series was broadcast on ITV from 16 August 2008 until 13 December 2008. Dermot O'Leary returned to present the main show on ITV, while Fearne Cotton was replaced by Holly Willoughby as presenter of spin-off show The Xtra Factor on ITV2. Simon Cowell, Louis Walsh, and Dannii Minogue returned to the judging panel. Sharon Osbourne left after four series and was replaced by Cheryl Cole. The series was won by Alexandra Burke, with Cole emerging as the winning mentor. Auditions in front of producers were held in April and May, with callbacks in front of the judges in June. The number of applicants for series 5 reached an all-time high with a reported 182,000 people auditioning. A number of well-established music acts from around the world, such as Beyoncé, Mariah Carey, Britney Spears, Girls Aloud, Take That, Il Divo, and series 3 winner Leona Lewis, performed during the live stages of the show.