Rapper Flo Rida scores a No. 1 Hot 100 hit this week with his debut single, as "Low" featuring T-Pain" jumps 2-1. Increased airplay and digital sales of 178,000 units helped the track dethrone Alicia

Rapper Flo Rida scores a No. 1 Hot 100 hit this week with his debut single, as "Low" featuring T-Pain" jumps 2-1. Increased airplay and digital sales of 178,000 units helped the track dethrone Alicia Keys' "No One," which slips to No. 2 after five weeks atop the chart.

On the Hot 100, Timbaland's "Apologize" featuring OneRepublic holds at No. 3, Chris Brown's "Kiss Kiss" featuring T-Pain remains at No. 4 and Fergie's "Clumsy" sticks at No. 5. Finger Eleven's "Paralyzer" inches up 7-6, trading places with Colbie Caillat's "Bubbly."

Jordin Sparks' "Tattoo" holds at No. 8, followed by Sara Bareilles' "Love Song," up 16-9 due to continued exposure from a Rhapsody TV commercial. Rihanna's "Hate That I Love You" featuring Ne-Yo is down 9-10 to round out the top tier.

Another Chris Brown track, "With You," is the chart's fastest grower at radio and moves 25-16. The Hot 100's top debut is Alvin and the Chipmunks' "The Chipmunk Song (Christmas Don't Be Late) (2007)," at No. 70. The update of the 1958 holiday evergreen appears on the "Alvin and the Chipmunks" film soundtrack, which soars 67-48 this week on The Billboard 200.

On Hot R&B/Hip-Hop Songs, Keys becomes only the second artist since this chart began using Nielsen Music data in 1992 to succeed herself at No. 1, as "Like You'll Never See Me Again" jumps 2-1 and trades places with "No One," which had ruled for 10 weeks. Nelly accomplished the feet in 2002 with "Hot in Herre" and "Dilemma."

Taylor Swift begins a third week at No. 1 on Hot Country Songs, where Carrie Underwood is the greatest gainer with "All-American Girl" (25-17). On the Modern Rock chart, Seether's "Fake It" ends the record-breaking 18-week run at the top by the Foo Fighters' "The Pretender," which falls to No. 2. "Fake It" is also No. 1 on Mainstream Rock for an eighth frame.