MTV sent over these details: It's up to Britney fans and all MTV.com readers to vote in the first round, where we have pitted 30 of Britney's iconic videos against each other bracket-style to battle it out for the highest honor of being named the Best Britney Video Ever, just in time for Spears' 30th birthday December 2.

The first round of voting is open until Tuesday at 11:59 p.m., at which point the 30 videos will be narrowed down to the top 16. You can vote as many times as you wish and campaign as much as you see fit for your favorite videos to move on to the next round of voting.

Will the classic " ... Baby One More Time" go all the way? Or are we still intoxicated by "Toxic"? MTV News correspondents will weigh in with their picks, alongside celebrities and Britney experts alike.

Since 30 videos is an unusual number to balance a tournament bracket, we have automatically pushed forward Britney's only two VMA-winning videos — "Piece of Me" and "Till the World Ends" — to the second round, where they will no longer be safe from elimination.

Don't forget about the lesser-known videos that may not have received much airtime, including "My Prerogative" and "Do Somethin'," since there's something unique about each clip. Make your votes count — and remember, you are voting for your favorite videos, not songs!

Voting for round two begins at 7 a.m. Wednesday and will last all the way through Thanksgiving weekend, closing Sunday at 11:59 p.m.

As of Monday, November 28, we will begin with eight videos, then four, then two, until we announce the winner Friday, December 2 — Britney's actual 30th birthday!

Start voting and keep up with us at MTVNews.com through December to see which clip reigns victorious.