It's the British Invasion of the 1960s all over again. Except this time the invaders are nine pretty Korean girls rather than four handsome boys from Liverpool with mop-top haircuts.

Last night the Korean Invasion picked up steam when the young Korean women who form Korean Pop (K-Pop) super group Girls' Generation sang and danced on David Letterman's stage while computerized pop music and a flashy lights show accompanied them. This morning they performed on Live with Regis and Kelly!

Girl's Generation performed for the first time in the U.S. October, singing to a sold-out Madison Square Garden alongside several other popular K-Pop groups. Since forming in 2007 the group has become one of the most popular in Korea. Their first single, Gee, topped multiple Korean music charts, and the song's official music video on YouTube has over 64 million views. Their new song, The Boys, which they performed in its English version on American television, made it onto the Billboard Heatseekers Chart, which lists popular new artists.

K-Pop is reminiscent of the shiny, mass-produced pop songs the American music industry was pumping out in the late 1990s. The main differences being that the Korean groups usually have more members, and that their music is even more energetic than its American counterpart. In Korea, and much of Asia, K-Pop has become ubiquitous. Teenagers are obsessed and get their hair cut in the K-Pop style.

Whether or not the genre will take hold in the U.S. is still unclear, but this YouTube video of American childrens' reactions to listening to Girl's Generation and two other KPop groups (2NE1 and SuperJunior) suggests that even the youngest generation of American's may not be ready for KPop.