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The 'Who's Laughing Now' singer will be the celebrity entertainment at this year's bash.
The MTV VMAs take place this Sunday in LA, and Jessie J will be pumping out the tunes as the house DJ for the night.
"So it was announced that I'm this years entertainment at the MTV VMAS while I was on the plane :)," Jessie said on Twitter.
"It was supposed to be a surprise... Lol. *SURPRISEEE*."
The 'Price Tag' star will be providing entertainment for the likes of Lady Gaga, Pitbull, Nicki Minaj, Adele and Bruno Mars who are all said to be performing on the night.