Earlier today, SM Entertainment released Girls' Generation's long-awaited 4th mini-album 'Mr.Mr' through music sites and iTunes.  Unsurprisingly, within a very short amount of time, the girls achieved an all-kill!

"Mr.Mr" immediately jumped to #1 on Melon, Genie, Mnet, Daum, Monkey3, Olleh, Bugs, Soribada, and Naver.

The other tracks on the album are also doing well on the charts, even taking all top six spots on some.  "Mr.Mr" was created by world renowned producers The Underdogs, featuring a unique R&B sound.  Along with the choreography created by Jillian Meyers, the girls are sure to take the Mnet's 'M!  Countdown' by storm on March 6!

SEE ALSO: The wait is finally over, Girls' Generation's 'Mr.Mr' mini-album is officially out!

Which is your favorite song on their album?