Yes buddy !

Quoted from the website: http://www.starbucks.com/card/card-terms-and-conditions
"All amounts loaded onto your Starbucks Card are held and denominated in the currency of the country in which the card was sold (the “base currency”). When you make a purchase in a different country, the transaction total is converted from the currency of that country (the “local currency”) to the base currency and deducted from the account. No fees or other charges are made to your Starbucks Card for the conversion. Although the actual balance of your Starbucks Card is held in the base currency, the balance shown on your receipt will be in the local currency of the store location. Transactions that occur on our website are denominated in U.S. dollars. Currency conversions are based on currency exchange rates applicable on the date of the transaction."