Mariah Carey's "We Belong Together" and Gwen Stefani's "Hollaback Girl" retained their first and second spots in Billboard's Hot 100 Thursday.

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The third through fifth positions also remained unchanged, with Ciara's "Oh" featuring Ludacris in third, 50 Cent's "Just a Lil Bit" fourth and the Black Eyed Peas' "Don't Phunk With My Heart" in fifth place.

Green Day's "Holiday" is No. 1 again this week on the Mainstream Rock chart, while Nine Inch Nails' "The Hand That Feeds" is atop the Modern Rock tally for a third week.

"Pimpin' All Over the World" by Ludacris featuring Bobby Valentino is the Hot 100's top debut at No. 81.

The Ying Yang Twins' "Wait (The Whisper Song)," moved from No. 20 to the 15th spot. It has also been No. 1 on Billboard's Hot Ringtones chart for weeks.

On Billboard's Hot Country Songs chart, Keith Urban's "Making Memories of Us" is No. 1 for a third straight week, while "Bless This Broken Road" by new "American Idol" Carrie Underwood and Rascal Flatts reached No. 50.