Christie Brinkley is returning to the pages of the Sports Illustrated Swimsuit issue at age 63. And this time she's appearing with her two daughters.

Brinkley shared a picture on Instagram of herself with 31-year-old Alexa Ray Joel, her daughter with singer Billy Joel, and 18-year-old Sailor Brinkley Cook, in the issue coming out this month.

In the Instagram post , Brinkley thanks 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."

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Brinkley told People magazine she had thought her days of posing in a bathing suit were over when she turned 30. But she said getting to pose with her daughters convinced her to do it again.

Joel shared a picture of herself solo on Instagram saying, "This was a lesson in learning to let go, take the plunge, and embrace myself from both the inside AND out- which is something I struggle with each and every day."

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Cook commented on Instagram, "I now have grown to know that my body is worthy of so many great things. I don't need to be a size 0 to believe in myself."

Brinkley first appeared on the cover of the Swimsuit issue in 1979.

The Associated Press contributed to this report.