Ah grasshopper - wait till 7 years, when all settles, and you have figured out her routines, habits, etc. THEN and only then, can you sneak stuff into the house without being caught (or posted to a friend, so she doesn't sign for it
)
Mine buys rings etc all the time. I don't bat an eyelid, she's happy. I mean, I have enough goodies for myself
Sometimes after a large purchase, I buy her a nice ring or something too, just because I love her (in other words, GUILT trip)