Travelling from the US to Hongkong and Beijing

My husband & I are travelling from the US to Hongkong for 2 days. From Hongkong, we plan to take a train or fly to Beijing and will stay there for 4 days to see some tourist spots and return to the US. My husband is a US citizen and I am a US resident holding a Philippine passport. Do we need a visa to go to Beijing and if so, what are the requirements? Is my fee going to be considered as a citizen of another country?