Tarako Cupie Girls.

TV in Japan Blog has a curiously strange and nightmarishly cute dance/song number of the Tarako Cupie Girls, the spokespeople for a Japanese company which sells spaghetti noodles with cod rod roe (eggs). I think that's what the hat's supposed to signify.

Watch at your own risk - the song is impossible to get out of your head afterwards. Hit play or go to Link [YouTube]. Not enough? See more at TV in Japan's blog post.