Nina Agdal and beau Jack Brinkley-Cook work up a sweat with a Hamptons workout

Nina Agdal showed off her taut midriff in exercise gear while working up a sweat in the Hamptons this week.

The 28-year-old Danish supermodel was enjoying some quality time with her boyfriend Jack Brinkley-Cook, who is Christie Brinkley’s son.

Sweeping her blonde hair up into a high ponytail, she clashed a true blue bra-lette with pink shorts that flaunted her sculpted legs.

Meanwhile her 25-year-old boyfriend showed off his toned arms and musclebound legs in a clinging T-shirt and shorts combo.

The showbiz hot couple have been hunkering down at Christie’s home in the Hamptons, which includes an observation tower that has stood for over a century. 

Christie shot to fame covering the Sports Illustrated Swimsuit Issue in the 1970s, and Nina has followed in her footsteps to cover the magazine.

Nina first became an international sensation during her relationship with Leonardo DiCaprio, who is 17 years older than she.

The pair of them split in 2017 when Nina was 25, and he is now dating 23-year-old blonde Camila Morrone, whose mother used to date Al Pacino.

Last month Nina rang in her third anniversary with Jack by posting a sweet album that showed them cuddling up and kissing during a beach picnic.

She gushed: ‘3 years later. Still on a beach. Still drinking wine. Still cracking jokes no one else would find funny.’ 

Jack’s biological father is Christie’s third husband Richard Taubman, but he was adopted by her fourth husband Peter Cook, who is not to be confused with the English comedian of the same name.

Christie also has two daughters – Sailor, 22, by Peter, and Alexa, 34, whom she shares with her second ex-husband, singing star Billy Joel.