Jonas Brothers host, Miley Cyrus sings on the Teen Choice Awards! Watch tonight

Miley Cyrus is doing her newest single, "Party in the U.S.A.," at TC 09. That's right, the pop Mega Star is all set to sing for you!

Adam Lambert and Kris Allen are up for the Choice TV: Male Reality/Variety Star award, and Adam is up for the Choice Red Carpet Fashion Icon: Male award.

And, of course, you won't want to miss Dare the Jonas Brothers! That's going to be hilarious!

And, it's official. The casts of "Twilight" (Robert Pattison, Kristen Stewart, Taylor Lautner, Ashley Greene, Nikki Reed and Kellan Lutz) and FOX's new comedy series GLEE (Lea Michele, Cory Monteith, Jenna Ushkowitz, Chris Colver, Amber Riley and Kevin McHale) will appear on the show too!

Also... David Beckham, Zac Efron, Megan Fox, Cameron Diaz, Jennifer Morrison, Keke Palmer, Alexis Bledel, Chace Crawford, Leighton Meester, Ellen DeGeneres and Ashley Tisdale all be there- so you'd better be there too!

Your votes pick the winners of the Teen Choice 2009 so be sure to tune in Monday, Aug. 10 (8:00-10:00 PM ET/PT) on FOX and see how your favorites did.