Britney Spears Brawls With Herself in New Music Video

Britney Spears is a knockout -- literally!

In the newly released music video for "Hold It Against Me," the 29-year-old pop star goes head-to-head with herself in the Jonas Akerlund-directed clip. (See the battle begin at the 2:47 mark).

Fighting off her doppleganger, Spears kicks, punches and throws herself to the ground in the comeback clip; when the battle ends, both versions of Spears fall to the floor in defeat.

"Hope you guys love it as much as I do," Spears tweeted Thursday night. "If you didn't, I'll kung fu kick you like I did to that chick in the video."