It should be the happiest time of the year for the Kardashians; Kim and Kanye West [1] welcomed baby Saint [2] on Dec. 5 and Kourtney celebrated the birthday of sons Mason and Reign [3] on Dec. 14 — but a break-in at matriarch Kris Jenner's home on Tuesday has the family shaken up. A crazed fan walked right through the front door [4] and into the home office, where he came face-to-face with a shocked Kris. Making the intrusion even more disturbing is the fact that Kim, North, and Saint were all home at the time (they're staying there while their mansion undergoes renovations [5]). While the fan was escorted out the neighborhood and detained by police, Kris is understandably fuming that such a lapse in security could happen despite the 24-hour surveillance she has on her home. She reportedly fired her entire security team and Kanye has sent his security detail of off-duty cops to stand guard over the house until everything gets sorted out. Hopefully they'll be back to safe and sound by Christmas.