Christie Brinkley and her daughter are "twins."
"A couple of travel-weary but happy Pirates in the Caribbeans!" Brinkley captioned the carousel of mother-daughter photos.
Fans quickly responded to the post, pointing out the likeness between the supermodel and her daughter, and praising their close relationship.
"Mama and her mini-me," one Instagram user commented, while another wrote, "Beauties inside and out! Sailor has that Brinkley smile."
"Twinning!" one commenter added.
"You two look more like sisters the way you're aging! So pretty!" another wrote.
"Awww twins! You two look like you have a beautiful mother-daughter relationship. Love to see it. Sailor has the trademark beaming Brinkley smile!" someone else penned.
Earlier this month, Brinkley revealed her secret to looking "ageless" to her more than 750,000 Instagram followers.
"When you eat too much at 68, it’s not as easy to lose the weight. So here’s a tip that’s tried and true, that will make you feel like your best you," she said.
"Avoid the sugar and do exercise," Brinkley wrote. "It’s not about the size of your thighs; vibrant good health will be your prize!"
Back in February, Brinkley opened up about facing ageism, and why the term "aging gracefully" should be about more than just looks. The admission followed a Buzzfeed article that included the star in a list of celebrities older than 50 who "prove" that "being older is attractive."
While the article was meant to empower women not to fear growing older, Brinkley worried it focused too much on a woman's ability to remain looking youthful.
"The expression 'aging gracefully' should not be about one’s looks but about the attitude and energy one offers the world," Brinkley wrote via Instagram. "Looking good is a byproduct of feeling great and showing up in the world with a heart full of good intentions, and good energy!"