Christie Brinkley delighted her legions of fans ahead of her 67th birthday sporting an incredible athleisure wear ensemble of spandex leggings and a snug crop top. The incredibly fit supermodel has proven time and again that age is just a number and even joked about stopping the clock in a lengthy post ahead of her birthday next week.MORE: Christie Brinkley unveils major hair transformation - and she cut it herself"In 8 days, it’s going to be Groundhogs Day! And I’ll be turning 50 for the 17th