OMG the rehearsal video for her performance Sunday night is HOT! Watch it right now! (It’s only a few seconds, sadly.) Go Brit Go!

Las Vegas, NV, September 6, 2007 – After weeks of mind-blowing media speculation, MTV confirms today that Britney Spears will be opening the 2007 MTV Video Music Awards. Celebrating her long awaited comeback to her fans, Spears will be performing LIVE her new song “Gimme More” from her highly anticipated new album due on November 13th. The star studded awards show will air live Sunday, September 9th at 9PM Live ET/Tape delayed PT.

Immediately following Spears’ performance, fans who want more of the superstar can download two ringtones available exclusively through MTV Mobile for two days prior to any other service. The tones — one for “Gimme More” and the other featuring the much discussed “It’s Britney, B****” catch phrase from “Gimme More’s” intro — are available for fans who text “Gimme” or “Brit” to 33633. MTV Mobile also will carry a live simulcast of the show, a first ever for an awards show.

For more about Spears at the VMAs, MTV.com will have exclusive details about her performance, as well as a look back at her history at the VMAs. The star-packed event will also feature one night only performances by Kanye West, Fall Out Boy, Chris Brown, Foo Fighters, Rihanna, Common, Nelly Furtado, Gym Class Heroes, Akon and Soulja Boy, T-Pain, Cee-Lo, Daniel Merriweather, Lil’ Wayne, Alicia Keys, T.I., Adam Levine, Mastadon, and Serj from System of A Down. Diddy, Sarah Silverman, Seth Rogen, Bill Hader, Kid Rock Jamie Foxx, Jennifer Garner, Pamela Anderson, the cast of Entourage, Shia Labeouf, Nicole Scherzinger, Robin Thicke, Megan Fox, Jennifer Hudson, Rosario Dawson and Eve are set to present at the “2007 MTV Video Music Awards.” In addition, Justin Timberlake with Timbaland are set to host a Fantasy Suite party, while critically acclaimed producer, artist and DJ Mark Ronson will rock the party in The Pearl with help from his turntables, horn section and surprise guests. This year, Timbaland will also find himself working overtime as the official Maestro of the VMAs, responsible for creating several show-stopping and unexpected artist collaborations.