I mean, T-Swift can obviously rap a little (http://nymag.com/daily/entertainment/2011/02/taylor_swift_raps_nicki_minaj.html and http://nymag.com/daily/entertainment/2011/08/taylor_swift_lose_yourself.html), and both are really awesome and should do a song together.
Yes, I have been listening to Super Bass and Speak Now all night, why do you ask?