Celebrating the holidays and the occasions of the Kuffar is certainly Haram. You are not permitted to do it. Nor are your rulers allowed to make these (Kufr) holidays as official holidays, since it is an imitation of the Kuffar.
Imitating the Kuffar in any of their religious affairs or in any gesture that distinguishes them as groups is forbidden. Al-Bukhari narrated in his Sahih (book) that Abu Saeed Al-Khudri رضي الله عنه reported that Allah's Messenger صلى الله عليه وآله وسلم said: "You will indeed follow the ways of those before you, hand span by hand span, and an arms length after another. Even if they enter into a lizards hole, you will follow them. We asked, is it the Jews and the Christians? He صلى الله عليه وآله وسلم replied, Who else!"
This hadith condemns imitating them. It is a proof for the prohibitions of imitating the Jews and the Christians in their occasions, symbols, or any matter related to their belief.
P/s:I don't celebrate new year =)
