It goes without saying that A Pink was the most successful girl group to have debuted in 2011. Their success didn't come without hard work, though, and their practice video for �"My My" shows just that. Dressed in cozy winter outfits, the girls practice each step diligently in an impeccably clean rehearsal room. As is tradition with rehearsal videos, their bare faces stand out, as well as the way they indicate who's singing with the raised arm. Check it out below!