The song shot to number one, giving Spears' her star power and cementing her status as a pop culture icon. The song was number 25 in Rolling Stones' list of the greatest pop songs since 1963, and the single went onto sell more than 9 million copies worldwide.
But for every great hit that Spears picked up, there are others that she rejected.
Lady Gaga initially wrote "Telephone" with the intention of including it on Spear's sixth album, Circus, in 2008. When Spears' rejected the song, Gaga invited Beyonce to join her on the track that would appear on Gaga's third record, The Fame Monster. The song went onto earn a Grammy nomination and top the charts.
Lady Gaga wasn't the only one to have a smash hit after its initial rejection from Britney Spears. The critically acclaimed "Umbrella" was originally offered to both Spears and Mary J. Blige before landing Rihanna and Jay-Z a Grammy award for Best Rap/Sung Collaboration and a nominee for song of the year in 2007.
