The song marks the British singer's first U.S. chart topper.

Coming in at No. 2 on the Billboard Hot 100 is Usher's "Love in This Club" featuring Young Jeezy, followed by Ray J and Yung Berg's "Sexy Can I" at No. 3, Chris Brown's "With You" at No. 4 and Sara Bareilles' "Love Song" at No. 5.

Rounding out the top tier are Jordin Sparks' "No Air" featuring Chris Brown at No. 6, Flo Rida's "Low" featuring T-Pain at No. 7, Rihanna's "Don't Stop the Music" at No. 8, Lil Wayne's "Lollipop" featuring Static Major at No. 9 and Lil Mama's "Shawty Get Loose" at No. 10.