Christie Brinkley, at 70 years old, shocked fans during a recent appearance at a recent launch party – and people have a lot to say about it…

Despite the iconic model‘s radiant appearance, her choice of outfit sparked some debate among onlookers, with some finding it too revealing for her age.

Brinkley had been invited to the Sports Illustrated Swimsuit Issue launch party, celebrating the publication’s 60th anniversary edition, when she turned heads in a daring $225 gown that featured a thigh-high slit and extra-long, dramatic sleeves that gracefully swept the floor.

“I am grateful beyond measure for my many happy adventures with @si_swimsuit,” she wrote in the caption, writing how “lucky” she felt to get to know some of the women pictured.

Fans were quick to shower the ageless beauty with compliments for her stunning red number, praising her radiant and glowing look. “Stunning as always,” one admirer noted, while another added: “I’ve got to give it to her, she looks awesome in this dress!”