This isn’t actually a song performed by Girls’ Generation, but rather a song about the girls. It’s by Yoo Young-jin (유영진), who is one of the producers/songwriters at SM Entertainment.
Girls’ Generation ~ Beautiful Girls (Feat. Yoo Young-jin)
21MB 3:57 H.264/AVC 480×272 PSP Ready
Credit: source vid. blueaqua1018@jpopsuki
The song comes as a bonus track on SNSD’s 1st Asia Tour: Into the New World album. The song is not all that good to be honest, but it’s an homage to the girls.