It will be the wholesome pop group's first-ever appearance at the event, known for its decadence and eye-popping water cooler moments (many involving Britney Spears).

In a statement, brothers Kevin, Joe and Nick said: “This is an awesome opportunity. We have grown up watching all the amazing and iconic performances on the VMAs. It is an honor to be a part of something so incredible.”

The 2008 MTV Video Music Awards will air live from Paramount Pictures Studios in Los Angeles on Sept. 7. (MTV and Paramount are corporate cousins within Viacom Inc.)

As previously announced, in a first for the awards, MTV will enlist its Web-savvy, youthful audience to help decide the nominees.

Viewers can vote on two categories each week including Video of the Year and Best New Artist by visiting the awards' Web site.