Buoyed by increasing airplay, Katy Perry's "I Kissed a Girl" starts a second week at No. 1 on the Billboard Hot 100 this week. "Girl" is the first song since Gnarls Barkley's "Crazy" to simultaneously

Buoyed by increasing airplay, Katy Perry's "I Kissed a Girl" starts a second week at No. 1 on the Billboard Hot 100 this week. "Girl" is the first song since Gnarls Barkley's "Crazy" to simultaneously appear on the Mainstream Top 40, Rhythmic, Adult Top 40 and Alternative charts.

But there's some stiff competition from the Jonas Brothers this week, as their new single "Burnin' Up" debuts at No. 5, the second-best entry by a group this decade. Only Fall Out Boy's "This Ain't a Scene, It's an Arms Race" started better when it debuted at No. 2 in February 2007.

In between, positions 2-4 (Lil Wayne's "Lollipop," Leona Lewis' "Bleeding Love" and Rihanna's "Take a Bow") remain the same as last week. Coldplay's "Viva La Vida" also holds at No. 6, while Plies' "Bust It Baby Pt. 2" featuring Ne-Yo rises 8-7, trading places with Chris Brown's "Forever."

Demi Lovato and Joe Jonas' "This Is Me," from the "Camp Rock" soundtrack, moves 11-9 in just its second week, while Natasha Bedingfield's "Pocketful of Sunshine" drops 5-10 to round out the top tier.

Also new this week is Sugarland, Little Big Town and Jake Owen's cover of Dream Academy's '80s hit "Life in a Northern Town," which opens at No. 43. The track is No. 29 on Hot Country Songs. Jessica Simpson's "Come on Over," her first country foray, starts No. 65 on the Hot 100. It's No. 27 on Hot Country Songs this week.

Keyshia Cole's "Heaven Sent" rules Hot R&B/Hip-Hop Songs for a fourth week. Rihanna's "Take a Bow" is the greatest airplay gainer there, rocketing 24-11. The top debut comes from Mariah Carey's "I'll Be Lovin' U Long Time" at No. 62, her 45th career entry on this chart.

Montgomery Gentry jumps 3-1 to overtake Hot Country Songs with "Back When I Knew It All." Billboard's rock charts are unchanged at the top, with Weezer's "Pork and Beans" at No. 1 on Modern Rock for a ninth week and Disturbed's "Inside the Fire" leading Mainstream Rock for a ninth as well.