pairing phones

[AUSCAL50]

I bought my phone and my wife's phone at the same time, we both have Droid's. The problem is we get each others information without asking for it.

I get her calendar on my calendar, and things like that. I ordered a Christmas gift from eBay for her, and she received a shipped conformation on her phone. Now she knows one thing, she is getting this year. Can anyone help me with information on what I can do to fix this?