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Akon's "Don't Matter" begins a second week at #1 on the Hot 100, and also rises to #7 on Billboard Hot R&B/Hip-Hop Songs Chart. MIMS' former Hot 100 #1, "This Is Why I'm Hot," inches up to #3, while fellow ex-chart-topper "Glamorous" by Fergie featuring Ludacris is down to #4.

A week after making the largest jump in Hot 100 history (#94-#3), Beyonce and Shakira's "Beautiful Liar" drops to #6. Justin Timberlake's "What Goes Around ... Comes Around" is up to #8. Diddy's "Last Night" featuring Keyshia Cole moves 12-10.

Billboard's fastest growing track at radio is T-Pain's "Buy U a Drank (Shawty Snappin')" featuring Yung Joc, which jumps to #14 and to #5 on Hot R&B/Hip-Hop Songs. Among the other Hot 100 debuts this week are DJ Khaled's "We Takin' Over" featuring T.I., Akon, Rick Ross, Fat Joe, Lil' Wayne and Baby at #75.