At the beginning of February,

Christie Brinkley

 turned 70 years old. It's hard to believe, because she has an incredible appearance.

The supermodel celebrated her anniversary with her children and friends in the Caribbean.

Christie Brinkley/Instagram

Christie Brinkley/Instagram

On Instagram, Brinkley published interesting photos from the celebration. The birthday girl had a party on a yacht. They took pictures, splashed in the water, swam and sunbathed.

Christie Brinkley/Instagram

Christy showed off her toned figure in a red Malibu Lifeguard-style one-piece swimsuit.

Christie Brinkley/Instagram

She completed her bow with a colorful shirt, straw hat, knitted floral minishorts, a boho woven shoulder bag, black glasses and a watch.

Christie Brinkley/Instagram

Christie Brinkley/Instagram

Last time, Christy posed on a yacht in a black longsleeve.