There is initial support to make have a seamless use of pandas and R/rpy.
You'll need to do:
from rpy2.robjects import pandas2ri
pandas2ri.activate()
The documentation is a little behind, and the support is not complete, but there is small example to show where this is heading:
https://plus.google.com/116424798545383828852/posts/jPfZ8VcTVi3