CHRISTIE BRINKLEY has proved age is just a number by appearing on the cover of Sports Illustrated’s annual Swimsuit Issue.

    This year’s cover sees the 63-year-old posing alongside her two daughters — Sailor Brinkley Cook and Alexa Ray Joel.

    Writing on Instagram, Brinkley said: “Thank you 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 appears to be literally walking on water in the photo — something she referred to in her Instagram post.

    “My kids think I walk on water, so let’s not mention the apple box concealed just under the surface,” she joked.

    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.

    She continued to be a successful model, appearing on the cover of Playboy and Men’s Health. In 1985, she married Uptown Girl singer Billy Joel, who is Alexa’s father. The couple divorced eight years later.

    In its editorial, Sports Illustrated said Brinkley was “out to prove that age is nothing more than a number.”

    (SD-Agencies)