<Table> Key <Tr> <Td> </Td> <Td> Indicates best - performing single of 2011 </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Indicates best - performing single of 2011 </Td> </Tr> <Table> <Tr> <Th> Issue date </Th> <Th> Song </Th> <Th> Artist (s) </Th> <Th> Ref . </Th> </Tr> <Tr> <Td> January 1 </Td> <Td> "Firework" </Td> <Td> Katy Perry </Td> <Td> </Td> </Tr> <Tr> <Td> January 8 </Td> <Td> "Grenade" </Td> <Td> Bruno Mars </Td> <Td> </Td> </Tr> <Tr> <Td> January 15 </Td> <Td> "Firework" </Td> <Td> Katy Perry </Td> <Td> </Td> </Tr> <Tr> <Td> January 22 </Td> <Td> "Grenade" </Td> <Td> Bruno Mars </Td> <Td> </Td> </Tr> <Tr> <Td> January 29 </Td> <Td> "Hold It Against Me" </Td> <Td> Britney Spears </Td> <Td> </Td> </Tr> <Tr> <Td> February 5 </Td> <Td> "Grenade" </Td> <Td> Bruno Mars </Td> <Td> </Td> </Tr> <Tr> <Td> February 12 </Td> <Td> </Td> </Tr> <Tr> <Td> February 19 </Td> <Td> "Black and Yellow" </Td> <Td> Wiz Khalifa </Td> <Td> </Td> </Tr> <Tr> <Td> February 26 </Td> <Td> "Born This Way" </Td> <Td> Lady Gaga </Td> <Td> </Td> </Tr> <Tr> <Td> March 5 </Td> <Td> </Td> </Tr> <Tr> <Td> March 12 </Td> <Td> </Td> </Tr> <Tr> <Td> March 19 </Td> <Td> </Td> </Tr> <Tr> <Td> March 26 </Td> <Td> </Td> </Tr> <Tr> <Td> April 2 </Td> <Td> </Td> </Tr> <Tr> <Td> April 9 </Td> <Td> "E.T." </Td> <Td> Katy Perry featuring Kanye West </Td> <Td> </Td> </Tr> <Tr> <Td> April 16 </Td> <Td> </Td> </Tr> <Tr> <Td> April 23 </Td> <Td> </Td> </Tr> <Tr> <Td> April 30 </Td> <Td> "S&M" </Td> <Td> Rihanna featuring Britney Spears </Td> <Td> </Td> </Tr> <Tr> <Td> May 7 </Td> <Td> "E.T." </Td> <Td> Katy Perry featuring Kanye West </Td> <Td> </Td> </Tr> <Tr> <Td> May 14 </Td> <Td> </Td> </Tr> <Tr> <Td> May 21 </Td> <Td> "Rolling in the Deep" </Td> <Td> Adele </Td> <Td> </Td> </Tr> <Tr> <Td> May 28 </Td> <Td> </Td> </Tr> <Tr> <Td> June 4 </Td> <Td> </Td> </Tr> <Tr> <Td> June 11 </Td> <Td> </Td> </Tr> <Tr> <Td> June 18 </Td> <Td> </Td> </Tr> <Tr> <Td> June 25 </Td> <Td> </Td> </Tr> <Tr> <Td> July 2 </Td> <Td> </Td> </Tr> <Tr> <Td> July 9 </Td> <Td> "Give Me Everything" </Td> <Td> Pitbull featuring Ne - Yo, Afrojack and Nayer </Td> <Td> </Td> </Tr> <Tr> <Td> July 16 </Td> <Td> "Party Rock Anthem" </Td> <Td> LMFAO featuring Lauren Bennett and GoonRock </Td> <Td> </Td> </Tr> <Tr> <Td> July 23 </Td> <Td> </Td> </Tr> <Tr> <Td> July 30 </Td> <Td> </Td> </Tr> <Tr> <Td> August 6 </Td> <Td> </Td> </Tr> <Tr> <Td> August 13 </Td> <Td> </Td> </Tr> <Tr> <Td> August 20 </Td> <Td> </Td> </Tr> <Tr> <Td> August 27 </Td> <Td> "Last Friday Night (T.G.I.F.)" </Td> <Td> Katy Perry </Td> <Td> </Td> </Tr> <Tr> <Td> September 3 </Td> <Td> </Td> </Tr> <Tr> <Td> September 10 </Td> <Td> "Moves Like Jagger" </Td> <Td> Maroon 5 featuring Christina Aguilera </Td> <Td> </Td> </Tr> <Tr> <Td> September 17 </Td> <Td> "Someone Like You" </Td> <Td> Adele </Td> <Td> </Td> </Tr> <Tr> <Td> September 24 </Td> <Td> "Moves Like Jagger" </Td> <Td> Maroon 5 featuring Christina Aguilera </Td> <Td> </Td> </Tr> <Tr> <Td> October 1 </Td> <Td> </Td> </Tr> <Tr> <Td> October 8 </Td> <Td> </Td> </Tr> <Tr> <Td> October 15 </Td> <Td> "Someone Like You" </Td> <Td> Adele </Td> <Td> </Td> </Tr> <Tr> <Td> October 22 </Td> <Td> </Td> </Tr> <Tr> <Td> October 29 </Td> <Td> </Td> </Tr> <Tr> <Td> November 5 </Td> <Td> </Td> </Tr> <Tr> <Td> November 12 </Td> <Td> "We Found Love" </Td> <Td> Rihanna featuring Calvin Harris </Td> <Td> </Td> </Tr> <Tr> <Td> November 19 </Td> <Td> </Td> </Tr> <Tr> <Td> November 26 </Td> <Td> </Td> </Tr> <Tr> <Td> December 3 </Td> <Td> </Td> </Tr> <Tr> <Td> December 10 </Td> <Td> </Td> </Tr> <Tr> <Td> December 17 </Td> <Td> </Td> </Tr> <Tr> <Td> December 24 </Td> <Td> </Td> </Tr> <Tr> <Td> December 31 </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Issue date </Th> <Th> Song </Th> <Th> Artist (s) </Th> <Th> Ref . </Th> </Tr>

List of billboard hot 100 number-one singles of 2011
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