TV icon Betty White has had an illustrious career in television and film that has unbelievably spannedmore than 80 years, and she's showing no signs of stopping now.The Emmy-winning Golden Girls star, who turned a whopping 98 years young this past January, has signed on fora yet-to-be titled Christmas movie for Lifetime's It’s a Wonderful Lifetime slate.As reported by TVLine, White will play the sassy drill sergeant of a yuletide bootcamp of sorts who 'helps whip would-be Santas into shape, spreading the true meaning of Christmas and leading everyone to wonder: Is she secretly Mrs.