Can my wife travel to the UK with me?

My fiance and I just left the UK two weeks ago after six months. We rented a place for 6 months to our two names. We are about to get married in the week in Germany where I am a citizen. She comes from the USA. We then want to return to the UK after our marriage and have all the official documents, etc. I do not need a visa to visit the UK, but will it? Or is the proof of our marriage and passport sufficient to at least let us both in without any problem.