With a gangsta and a Neptune breathing down their necks, Usher and Alicia Keys manage to hold on to No. 1 on Billboard's Hot 100 for a third straight week with "My Boo." The hit duet is also in its fo

With a gangsta and a Neptune breathing down their necks, Usher and Alicia Keys manage to hold on to No. 1 on Billboard's Hot 100 for a third straight week with "My Boo." The hit duet is also in its fourth week reigning over the Hot R&B/Hip-Hop Airplay and Rhythmic Airplay charts.

But heating things up is Snoop Dogg's "Drop It Like It's Hot" featuring Pharrell, which makes a 4-2 move on the Hot 100. The track is the chart's greatest gainer at radio and retail for the second week in a row and marks a career high on the chart for Snoop. Additionally, "Drop It" is Snoop's first No. 1 on Billboard's Hot R&B/Hip-Hop Singles & Tracks chart, where the cut knocks "My Boo" to No. 2.

Last year Snoop went as high as No. 6 on the Hot 100 with "Beautiful" -- which also featured Pharrell, who with Chad Hugo forms the production duo the Neptunes -- and peaked at No. 2 on Hot R&B/Hip-Hop Singles & Tracks tally as a featured performer on Chingy's "Holidae Inn."

"Drop It Like It's Hot" is the lead single from Snoop's Geffen album "R&G (Rhythm & Gangsta): The Masterpiece." Originally due Nov. 23, the set has been pushed forward to Nov. 16 due to piracy concerns.

As Ciara's former Hot 100 No. 1, "Goodies" featuring Petey Pablo, drops to 2-3, her second single is gaining ground fast. After jumping 74-42 last week, "1, 2 Step" featuring Missy Elliott makes another giant leap to No. 24 on the new tally.

After two weeks at No. 3, Destiny's Child's "Lose My Breath" falls to No. 4, while Nelly stays in place for a second week at No. 5 with "Over and Over" featuring Tim McGraw. Eminem's "Just Lose It" gains two positions to No. 6; piracy concerns have also led Interscope to move his album, "Encore," from Nov. 16 to an off-cycle Friday release on Nov. 12.

Rounding out the Hot 100's top 10, Maroon5's "She Will Be Loved" drops 6-7, Kelly Clarkson's "Breakaway" jumps 9-8, Terror Squad's "Lean Back" falls 7-9 and Trick Daddy's "Let's Go" featuring Lil Jon & Twista is No. 10 for the second week.

Simple Plan's "Welcome to My Life" enters at No. 66 as the chart's top debut. The pop/punk act nabbed its highest Billboard 200 bow this week with its sophomore Lava set "Still Not Getting Any...," which opened at No. 3 on sales of 139,000 units.

Also making Hot 100 entrances this week are Darryl Worley's "Awful, Beautiful Life" (No. 72), LeAnn Rimes' "Nothin 'Bout Love Makes Sense" (No. 75), Twista's "So Sexy Chapter II (Like This)" featuring R. Kelly (No. 92) and Daddy Yankee's "Gasolina" (No. 96).

Among the tracks making significant upward moves are Mario's "Let Me Love You" (45-21), Gavin DeGraw's "I Don't Want to Be" (51-31) and Rupee's "Tempted to Touch" (64-46).

Elsewhere, Alison Krauss grabs her first sales chart No. 1 as a lead artist, as "Restless" debuts on top of Billboard's Hot Country Singles Sales tally. Phil Vassar's "In a Real Love" logs a second week atop the Hot Country Singles & Tracks chart.

Velvet Revolver's "Fall to Pieces" shows no sign of giving up the pole position on Billboard's Mainstream Rock Tracks tally in its sixth week, while U2's "Vertigo" is No. 1 on the Modern Rock Tracks list for a second week.