You might be able to get a free bonus star from Starbucks Rewards. This did work for me so no guarantees it will be available for every account but certainly worth a look.
You just want to head over to Starbucks Rewards here and scroll all the way down to the very bottom.
If you see that go ahead and click. For some reason they wanted me to download the financials for 2013. (Um… Starbucks I am not even ready for my own taxes.)
I just clicked and then closed out the PDF that was opening.
At the bottom of the screen I saw this:
The star won’t appear instantly- it can take up to 24 hours to show up. So go ahead and check again tomorrow and hopefully it is there for you!