On our last trip, Chat and I went travelling from resort to resort looking for desserts to buy with our DDP credits. DDP is not for us!
Anyways...we did see a birthday cake at the moderates and POP. All-Stars didn't have one, but it's funny because I specifically said something to Chat and a cm overheard. He said they try to keep a couple in the case, but sometimes cms don't see they are gone. Just ask a cm or a manager to get one from the back.
By the way, the reason I mentioned it to Chat? The one at POP was decorated with sprinkles and was really cute -- the ones at some of the mods were plain. It made an impact!
Didn't need one so we didn't try that, but it would be interesting to see if it's true!