the letter "a"

I had a birthday part this weekend and when Kaylea came downstairs and saw the cake, she said, "that's an A."  Jordy and I were in shock.  We did not tell her that there was an "A" on the top.  Later, we learned from our favorite day care workers that they have been working on letter recognition.  It was funny, because they didn't think any of the kids were picking up on it!