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)

Girls’ Generation ~ Beautiful Girls (Feat. Yoo Young-jin)

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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.