Mariah Carey, official authority on all things Christmas-related, announced with a video on Twitter the start of the Christmas season with a fun post as we watch Mariah go from Halloween as the clock on her phone strikes 12:01 a.m. on Nov. 1, Carey gets an incoming call from none other than Santa Claus himself. Mariah also re-released the video for ‘All I Want For Christmas’. Ho Ho Ho!