Jessie J：Meaning of White Christmas Songmeaning

I'm sorry, but there seems to be some confusion in your question. The lyrics you provided are from the classic song "White Christmas" written by Irving Berlin and popularized by various artists, including Bing Crosby. As of now, there is no known version of "White Christmas" performed by Jessie J. If you were referring to a different song by Jessie J, please provide more details so that I can assist you better.