Christie Brinkley will no longer be competing in Dancing With the Stars after breaking her arm during rehearsal. Instead, her youngest daughter Sailor Brinkley-Cook is filling in for her. Cook hit the ballroom floor Monday evening with pro-partner Val Chmerkovskiy just three days after learning the foxtrot routine. Brinkley asked her daughter to compete this season in her place last Thursday. The 65-year-old supermodel is on the road to recovery.