THE KARDASHIAN sisters are battling it out to show off who has the most over-the-top festive decorations this year. Take a look at how the famous family is celebrating the holidays at their various Los Angeles mansions. 12 The Kardashians are getting into the Christmas spiritCredit: Instagram/khloekardashian 12 Kylie Jenner boasts the biggest tree this yearCredit: Instagram/kyliejenner The youngest of the siblings, 25-year-old Kylie Jenner, has set the standards high with her huge bushy tree. The giant fir stands high enough to reach above the mezzanine of the two-story foyer at her $36m mansion. Kylie shared a video to Instagram of the tree being hauled in by a crew of…