JFK's grandson Jack Schlossberg makes acting debut on Blue Bloods

Jack Schlossberg, 25, the grandson of JFK has made his acting debut in Blue Bloods. Photo / Getty Images

John F. Kennedy's one and only grandson has made his acting debut.

The 25-year-old son of JFK's daughter, Caroline, and her husband, Edwin Schlossberg, appeared on the season 8 finale of the Tom Selleck show, Blue Bloods.

Schlossberg took to social media to share his delight at playing Officer Jack Hammer in the show, reports news.com.au.

View this post on Instagram

I don’t make the rules, I just pretend to enforce them — Cash me tonight on season 8 finale of Blue Bloods my dream come true!! Best show in the entire world.

A post shared by Jack Schlossberg (@jackuno) on May 11, 2018 at 4:30pm PDT

"I don't make the rules, I just pretend to enforce them — Cash me tonight on season 8 finale of Blue Bloods my dream come true!! Best show in the entire world," he wrote, along with a photo of himself in the police officer uniform alongside his mum Blue Bloods stars Will Estes, Vanessa Ray and executive producer Kevin Wade.

Schlossberg has two sisters, Rose and Tatiana.

He currently attends Harvard Law School and recently left the door open on a career in politics during and interview.

"I'm inspired by my family's legacy of public service. It's something that I'm very proud of," Schlossberg said during his first TV interview on "Today" in May 2017. "But I'm still trying to make my own way and figure things out. So stay tuned — I don't know what I'm going to do."