With explosive sales in their first week of digital release, Rihanna's "Umbrella" and Shop Boyz' "Party Like a Rockstar" rocket to the peak of the Billboard Hot 100. "Umbrella" soars 42-1 with 277,000

With explosive sales in their first week of digital release, Rihanna's "Umbrella" and Shop Boyz' "Party Like a Rockstar" rocket to the peak of the Billboard Hot 100. "Umbrella" soars 42-1 with 277,000 digital sales, the highest debut week sum since Nielsen SoundScan began tracking downloads in 2003. Meanwhile, "Party Like a Rockstar" flies 52-2 thanks to sales of 173,000 digital downloads.

For Rihanna, this is the second Hot 100 chart-topper of her young career, following "SOS" in 2006. As for "Party Like a Rockstar," its digital arrival results in a steep decline for a similarly named but musically different cut, "Do It Just Like a Rockstar" by Freak Nasty featuring Crazy Mike. That song, which has been available digitally and was mistakenly purchased by many consumers thinking it was the Shop Boyz track, plummets off the chart from No. 45 after a 62% drop in sales.

Last week's Hot 100 No. 1, Maroon 5's "Makes Me Wonder," slips to No. 3 this week. T-Pain's "Buy U a Drank (Shawty Snappin')" featuring Yung Joc is down 2-4, while Daughtry's "Home" inches up 6-5. Justin Timberlake's "Summer Love" rises 9-6, followed by Avril Lavigne's "Girlfriend," which is down 3-7. Fergie's "Big Girls Don't Cry" climbs 21-8 and is the chart's greatest digital gainer, giving the Black Eyed Peas vocalist her fourth top 10 hit from her 2006 solo album, "The Dutchess."

Kelly Clarkson's "Never Again" rebounds 17-9 after her appearance last week on the "American Idol" finale, and Huey's "Pop, Lock & Drop It" rounds out the top 10, slipping from No. 8.

Unsurprisingly, "Idol" winner Jordin Sparks has the Hot 100's top debut with "This Is My Now" at No. 15. At 74,5000 downloads, it's the lowest first-week sales total for an "Idol" coronation song ever, although this year's release is the first to be digital only, accompanied by a multi-track EP. "Idol" runner-up Blake Lewis debuts at No. 18 with his version of Bon Jovi's "You Give Love a Bad Name."

Also new to the Hot 100 this week are T.I.'s "Big Things Poppin' (Do It)" at No. 30, the reunited Smashing Pumpkins' "Tarantula" at No. 54 and Gwen Stefani's "4 in the Morning" at No. 76.

"Buy U a Drank" remains No. 1 on Hot R&B/Hip-Hop Songs for a fifth week. The top debut on that tally is Keyshia Cole's "Let It Go" featuring Missy Elliott and Lil' Kim.

Billy Currington's "Good Directions" begins a third week atop Hot Country Songs, on which Big & Rich finally score their first top 10 hit with "Lost in This Moment" (12-9). The chart's top debut comes from Phil Vassar's "This Is My Life" at No. 49. It's the first single from his Universal South debut, tentatively due Sept. 18.

On Hot Latin Songs, Enrique Iglesias' "Dimelo" is No. 1 for a third week, while John Mayer's "Waiting on the World To Change" returns to No. 1 on the Adult Contemporary chart with a 3-1 move. The song previously topped the chart in late February.

Linkin Park's "What I've Done" is No. 1 on Modern Rock for an eighth week and atop Mainstream Rock for a fifth. But the new Pumpkins song is making noise on both charts, soaring 30-5 on Modern Rock and earning the top debut on Mainstream Rock at No. 18.