D4L's "Laffy Taffy" ascends three rungs to claim the No. 1 spot on the Billboard Hot 100 this week. The cut ends the two-week run of Mariah Carey's "Don't Forget About Us," which drops considerably to

D4L's "Laffy Taffy" ascends three rungs to claim the No. 1 spot on the Billboard Hot 100 this week. The cut ends the two-week run of Mariah Carey's "Don't Forget About Us," which drops considerably to No. 7. "Laffy Taffy" is also the Hot 100's greatest sales gainer and rises 8-3 on the Pop 100. It remains No. 1 on the Hot Digital Songs chart.

Chris Brown's "Run It!" maintains the No. 2 spot on the Hot 100 but falls to No. 2 on the Pop 100, where Nickelback's "Photograph" jumps 4-1. The latter track also rises 5-3 on the Hot 100 and 5-2 on the Hot Digital Songs chart.

On the Hot 100, Kanye West's "Gold Digger" featuring Jamie Foxx leaps 8-4, while Nelly's "Grillz" featuring Paul Wall, Ali and Gipp drops 3-5. The Black Eyed Peas' "My Humps" climbs 10-6 and also remains No. 1 on the Hot Ringtones chart.

The Pussycat Dolls' "Stickwitu" falls 6-8 on the Hot 100, while Fall Out Boy's "Dance, Dance" breaks into the top 10, rising 15-9. Beyonce's "Check on It" featuring Slim Thug descends 7-10 to round out the Hot 100 top tier.

My Chemical Romance's "The Ghost of You" is this week's top debut at No. 84 and is the sole new track to enter the chart.

Mary J. Blige's "Be Without You" holds onto the No. 1 spot on the Hot R&B/Hip-Hop chart for a second week, as its parent album, "The Breakthrough," falls to No. 2 on The Billboard 200. Daddy Yankee's "Rompe" remains atop the Hot Latin Songs chart for a sixth straight week.

Rob Thomas' "Lonely No More" leaps from No. 13 to reclaim the No. 1 spot on the Adult Contemporary airplay chart from Kimberly Locke's "Up on the Housetop," which drops off the chart following the end of the holiday season.

Previously No. 2 on the Hot Country Songs chart, George Strait's "She Let Herself Go" seizes the top slot from Billy Currington's "Must Be Doin' Somethin' Right," which falls to No. 3. Strait thus earns his 40th No. 1 on the tally, tying him with Conway Twitty for the all-time lead (for more, see this week's Chart Beat).

For a fourth week, Foo Fighters' "DOA" tops the Modern Rock airplay tally, and Shinedown's "Save Me" leads the Mainstream Rock chart for an eighth week.

Questions? Comments? Let us know: @billboard

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