Voting in round three of MTV News' Britney Spears Tournament: 30 Videos for 30 Years has officially closed and we're now down to the Final Four. Will "Lucky" get lucky against the naughtier "Criminal" video? Will "Hold It Against Me" get served by "I'm a Slave 4 U"? Second-round voting is now open so you can help decide.

At the end of round three, "Lucky" pushed ahead of "Till the World Ends" at the last minute, beating the newer video by less than 0.5 percent of the vote. And although "Stronger" held the lead for most of the third round, "Criminal" overpowered the 2000 video late Tuesday night.

Britney's collaborator on "Me Against the Music," Madonna, officially exited the tournament after the duet fell to "Hold It Against Me," which also came as a last-minute surprise since the Brit/Madge collabo held the advantage for most of round three.

In perhaps the most competitive pairing of the third round, two of Britney's widely celebrated videos, "Toxic" and "I'm a Slave 4 U" were pitted against each other, but sweaty Britney out-danced double-agent Britney. MTV News' Britney video experts have already predicted that "Slave 4 U" will be the biggest threat in the Final Four.


Head over to Britney30.MTV.com and vote for your favorite music video in MTV News' Britney Spears Tournament: 30 Videos for 30 Years.

Voting for the top four clips is open until 7 a.m. Thursday; the top two will be unveiled at 10 a.m. on Thursday morning, followed by the big reveal of the winner at 10 a.m. ET on Friday, which happens to be Britney's 30th birthday.

Which Britney video are you rooting for? Let us know in the comments section below!

What's your favorite Britney video? Make sure to vote at Britney30.MTV.com or the MTV Newsroom blog, and share your picks in the comments below!