Christie Brinkley has proved age is just a number by appearing on the cover of Sports Illustrated's annual Swimsuit Issue. The timeless beauty who turned 63 this month, shared an Instagram Monday night posing in the water next to her daughters, Alexa Ray Joel, 31, and Sailor Brinkley Cook. Brinkley thanked Sports Illustrated "for sending the powerful message that good things come in packages of every size and we do not come with an expiration date.” Christie shot to fame after appearing in Sports Illustrated in the late 1970s and went on to become well known as an actress and TV personality.