John F. Kennedy's only grandson Jack Schlossberg makes his acting debut on 'Blue Bloods'

John F. Kennedy's only grandson is a TV star!

John "Jack" Schlossberg landed his first big acting role, appearing on Friday's Blue Bloods' season eight finale. The 25-year-old, whose parents are Caroline Bouvier Kennedy and Edwin Schlossberg , portrayed Officer Jack Hammer on the CBS crime drama, and took to Instagram on Friday to share pictures from his exciting time on set.

"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," Jack wrote alongside two pics of him in his uniform.

This content is not available due to your privacy preferences.
Update your settings here to see it.

He also shared a clip of his scene, which he captioned, "A line fraught with tension."

This content is not available due to your privacy preferences.
Update your settings here to see it.

Jack is currently a student at Harvard Law, and when he's not acting it seems like he's following in his famous family's footsteps. It was just one year ago, in May, that he made his first live TV appearance with his mom,, Caroline, on the Today show. During his interview he discussed his future in politics.

“I’m inspired by my family’s legacy of public service. It’s something that I’m very proud of,” said Schlossberg. “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.”

See more photos of Jack Schlossberg:

This content is not available due to your privacy preferences.
Update your settings here to see it.

RELATED CONTENT:

JFK and Jackie Kennedy's Granddaughter Tatiana Schlossberg Gets Married -- See the Wedding Pics!

Michelle Obama Presents the Arthur Ashe Award at the ESPYs With Emotional Tribute to Eunice Kennedy Shriver

JFK's Only Grandson Jack Schlossberg Makes First Live TV Appearance With Mom Caroline Kennedy