The MTV VMAs are this afternoon and after taking a look back at our favorite pictures from years past and Britney's hottest moment, it's time to get excited for tonight's big acts. Justin Bieber is more popular than ever with his Summer jam "Eenie Meenie," and he's ready to make the girls scream from the stage. His mentor Usher will show off his signature moves singing one of his hits like "DJ Got Us Fallin' In Love." Eminem is set to open the show with something powerful. The mystery of the night goes to Kanye West: will he stick to a track we know, premiere a new single or even deliver on a promise and debut an apologetic ballad for Taylor Swift. So, tell us — which VMA performance are you most excited to see tonight?