This is it -- the Championship Round of our Battle of the Brits competition! Marina + the Diamonds and Jessie J are champions of both their respective categories and the semi-finals! Now it's time to determine the ultimate favorite British artist.

Marina + the Diamonds is a force to be reckoned with! Not only does she have crazy-powerful vocals, her unique sound has earned her a legion of loyal fans. Last round, she beat out Scottish DJ Calvin Harris, but can she conquer Jessie J?

In one of the closest Battle of the Brits polls yet, Jessie J ousted One Direction by less than 1 percent! The boy band has tons of adoring fans, but that wasn't a match for Jessie's powerhouse voice and numerous collaborations. Can she maintain her momentum as she goes up against Marina?

Who do you think should win Battle of the Brits? You can vote once an hour until the poll closes at 2PM ET on Sept. 11.