Available at Paperchase http://www.paperchase.co.uk/pantry-peepers/pantry-peepers-fine-porcelain-mug-in-box/invt/00477635/ ($7.50)
Via: Super Cute Kawaii http://www.supercutekawaii.com/2010/09/paperchase-for-everyone/
Edible star glitter! I will always be blown away by the variety of food decorations that look inedible but are in fact safe! Also, the little fondant mug on top of this cupcake is filled with butterbeer so you get a little sip before you eat the creamy goodness below. Genius.