@theoutlawfades , gkumar,
I was in the same situation. Submitted on 12/25. My 2nd Recommender submitted his LOR on 12/30 so my application got pushed to "after new year".
More importantly, i was assuming that when the team came back on 4th, the application would automatically go under review but it did not happen and eventually I had to call on the 5th to confirm the same. My application went under review 30 minutes after the phone call.
In short, Yes you should call them.