Veuve Clicquot in fridge for 4 years?

I got this bottle when I got married about 4 years ago and it has never been opened, but it has sat in our fridge chilled this entire time. We just never got around to opening it. Any reason not to drink this? Looks perfectly fine to me, and it has been sitting on its side the entire time rolling from one side of the fridge to the next.