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Lily Allen made herself known on the Internet through her Myspace page, and following this exposure, her debut single "Smile" peaked at number one.
Three years later, her single "The Fear" topped the chart for four consecutive weeks, being the longest running number one single of 2009.
Over this period, Westlife were the most successful group and music act at reaching the top spot, with 11 number-one singles.
Rihanna and Jay-Z's song "Umbrella" spent 10 weeks at number one in 2007, the longest spell at the top of the charts since Wet Wet Wet's 1994 hit "Love Is All Around", which topped the charts for 15 weeks.
Before the advent of music downloads, it was based entirely on sales of physical singles from retail outlets, but since 2005 permanent downloads have been included in the chart compilation.
"Killing in the Name" by Rage Against the Machine was the final number one of the decade.A number of artists had number-one singles on their own as well as part of a collaboration.Madonna, Timbaland and Justin Timberlake's song "4 Minutes", for example, is counted for all three artists because they were credited on the cover, while "Where Is the Love?Elvis Presley scored four posthumous number ones, in 2002 on Junkie XL's remix of "A Little Less Conversation", and then in 2005 with "Jailhouse Rock", "I Got Stung" and "It's Now or Never" when all his number one singles were reissued and re-released to celebrate fifty years of his music.
The following artists achieved four or more number-one hits during the 2000s.It was the biggest-selling single by a female of the 21st century until 2011, when it was surpassed by Adele's "Someone like You".