Christie Brinkley looks stunning at 59

Christie Brinkley looked incredible in a floral mini-dress while posing with her children, Alexa, Jack, and Sailor at the Social Life Magazine soiree in New York Saturday.

At 59, Christie Brinkley’s mothered three grown children with three different husbands.

The evergreen supermodel and her brood transformed the Social Life Magazine‘s 10-year anniversary party at Watermill’s 70 Tanager Lane into a fabulous family affair.

Christie Brinkley, who looked more like the trio’s sister, flaunted her toned and tanned pins in the long-sleeve frock and nude peep-toe pumps.

Still sporting a gorgeous head of blonde hair, the magazine’s cover girl practically glowed as she cuddled the 27-year-old brunette and the 14-year-old redhead.

Alexa, whose father is singer Billy Joel, also displayed her slim pins in a bronze mini-skirt which she paired with a white blouse and nude platform pumps.

Sailor, whose father is architect Peter Cook, looked lovely in her blue-patterned romper, burgundy cardigan, and nude platform heels.

On Wednesday, Christie Brinkley announced that Sailor would officially kick off her modeling career in the August issue of Teen Vogue.

Meanwhile Jack, Christie Brinkley’s son with real estate developer Richard Taubman, will celebrate his 18th birthday next week.

Jack, who was legally adopted by Peter Cook, looked dapper in his black jacket, blue trousers, and black plimsolls.

The May issue, already on newsstands, features Christie Brinkley reclining poolside in a black criss-crossing bikini beneath a catsuit.

It was the first time Christie Brinkley had posed in a swimsuit in over 30 years.

The Sport’s Illustrated favorite was accused of becoming “addicted” to Instagram in Social Life.

“I find when I walk with a camera in my hand, I am extra alert and attuned to all the extraordinary beauty that abounds, from the smallest detail of a powdery pistil in a flower to the texture of the sky,” she said.

“Taking pictures intensifies my appreciation and awe.”

However, she defended her snap-happy enthusiasm on Facebook Friday.

“<<Addiction>>? Well…more like <<passion>> for taking pictures, which I share on Instagram,” Christie Brinkley noted, before wishing her fans a happy Memorial Day.

The four-time divorcée, who is worth more than $80 million, currently lives full time in the Hamptons.

Her personal life has seen many struggles in the past year – both her parents passed away and she finally resolved a lengthy and bitter custody battle with ex-husband Peter Cook.

Their marriage ended after Christie Brinkley discovered that Peter Cook had allegedly engaged in a two-year-long affair with the 17-year-old daughter of a police officer.

Christie Brinkley, who had the longest-running contract with Cover Girl, now focuses on her garden, skincare, eye-wear, and fabric lines.