Kristin Cavallari and her estranged husband, Jay Cutler, reunited for a fun Halloween celebration with their three children amid their divorce.The Very Cavallari alum, 33, shared a family photo via Instagram on Sunday, November 1, which featured the group wearing their costumes. Cavallari sported a unicorn onesie while Cutler, 37, wore a black-and-white striped jumpsuit.