Heard the same story a hundred times (regarding the wife). As others have said, it'll take time for her to get used to the new you. You cannot buckle under the pressure. It might take 6 months or a year, but if she knows that this is how you prefer to look, if she's a reasonable person, she'll grow to accept it, and perhaps even like it!

If you shave it, however, then every time in the future you want to grow a beard then she knows all she has to do is nag you enough and you'll buckle under the pressure. Shave it on your terms, nobody elses.

Patience shall be rewarded!

New beard growers: Check out the Rules of Beard Acquisition.
To upload and post pictures, here is a tutorial.
Do you believe in these Common Beard Myths?