Pandas Datetime: Calculate Number of Weeks Between Dates in Two Columns

Let's say I have a dataframe with two columns that contain dates, and I want to create a new columns whose value is the number of months between those dates.

>dfIndex   Date1         Date21       2012/03/07    2013/03/162       2012/12/05    2012/12/253       2010/06/30    2013/05/194       2002/11/02    2011.06.08df["Date1"]= pd.to_datetime(df["Date1"])df["Date2"]= pd.to_datetime(df["Date2"])

Date1 will always be before date2. My current method of doing this requires about 10 steps, and I'm pretty sure there's an easier way to do this. Thoughts?