Heheh. I always did think that Rarity, despite her refined tastes, still has something of a sweet tooth.

The episode really caught me off guard as well. Rainbow Dash I can understand, maybe even Pinkie taking a nibble in her sleep, but Fluttershy and Rarity? Way out of left field.

It's funny, because Applejack is the first to try and sneak a taste of the cake out in the open, yet she was innocent.