According to Billboard, the "Circus" star is the first artist in over three years to debut at number one on the Billboard chart. The last title to debut at number one was Taylor Hicks' "Do I Make You Proud" in July 2006.
The last time a non-"American Idol" single debuted at number one was when Lauryn Hill took the top spot for "Doo Wop (That Thing)" in 1998. "3" is Brit Brit's third single to top the Billboard Hot 100 -- "...Baby One More Time" and "Womanizer" also soared to the top of the charts.
Check out Britney's photo gallery below.