Girls' Generation, a nine-member girl group from South Korea, have been around for a while, but their third album is the first to find a release in the States. Last night they made their network TV debut on The Late Show With David Letterman, and the gaggle of gals made quite the impression on Dave and guests Regis Philbin and Bill Murray. 

Check out the performance of their album's title track below:

Some fun facts about Girls' Generation: they're one of the top musical acts in South Korea, they've had several television shows, and they may finally be crossing over to American audiences. My personal favorite fact? Their names are Yoona, Yuri, Hyoyeon, Sooyoung, Seohyun, Taeyeon, Sunny, Tiffany, and Jessica, which proves the theory that if you assemble nine girls in a group, you will get a Jessica in there. 

If you're jonesin' for some more K-pop realness, make sure you check out the video for their 2009 hit "Gee," which is the most gloriously manic thing I have ever seen.