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.

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

A line fraught with tension.

A post shared by Jack Schlossberg (@jackuno) on

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:

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A look at JFK's only grandson, John 'Jack' Schlossberg
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A look at JFK's only grandson, John 'Jack' Schlossberg
Jack Schlossberg, grandson of the late US president John F. Kennedy, speaks to guests before former US president Barack Obama received the 2017 John F. Kennedy Profile in Courage Award. / AFP PHOTO / Ryan McBride (Photo credit should read RYAN MCBRIDE/AFP/Getty Images)
Jack Schlossberg speaks at the John F. Kennedy New Frontier Award ceremony at the Kennedy School of Government at Harvard University in Cambridge, Massachusetts November 25, 2013. Schlossberg is Caroline Kennedy Schlossberg's son and President John F. Kennedy's grandson. REUTERS/Brian Snyder (UNITED STATES - Tags: EDUCATION POLITICS)
BOSTON, MA - MAY 03: John F. Kennedy's grandson Jack Schlossberg wears one of his grandfather's neckties at the 2015 JFK Profile in Courage Award ceremony honoring Bob Inglis at The John F. Kennedy Presidential Library And Museum on May 3, 2015 in Boston, Massachusetts. (Photo by Paul Marotta/Getty Images)
US Ambassador to Japan Caroline Kennedy (R) and her son Jack Schlossberg wait to greet US Secretary of State John Kerry (not in picture) upon his arrival at Iwakuni Marine Corps Air Station in Iwakuni on April 10, 2016. Kerry arrived in Japan on April 10 for a Group of Seven meeting in Hiroshima, marking the first-ever visit to the atomic-bombed city by a US secretary of state. / AFP / POOL / JONATHAN ERNST (Photo credit should read JONATHAN ERNST/AFP/Getty Images)
WASHINGTON - DECEMBER 4: Argentine pianist Martha Argerich, rock band the Eagles, screen and stage actor Al Pacino, gospel and blues singer Mavis Staples and musician James Taylor are recognized for their achievements in the arts during a star-studded celebration on the Kennedy Center Opera House stage. THE 39TH ANNUAL KENNEDY CENTER HONORS, to be broadcast Tuesday, Dec. 27 (9:00-11:00 PM, ET/PT), on the CBS Television Network. Pictured L-R: Rose Schlossberg, Jack Schlossber, and Tatiana Schlossberg, Grandchildren of John F. Kennedy (Photo by Jeffrey R. Staab/CBS via Getty Images)
BOSTON, MASSACHUSETTS - MAY 01: Jack Schlossberg speaks before presenting Connecticut Governor Dannel Malloy (D) with the 2016 John F. Kennedy Profile in Courage Award at The John F. Kennedy Presidential Library And Museum on May 1, 2016 in Boston, Massachusetts. In 2015 following the Paris terrorist attacks, Governor Malloy defended the U.S. resettlement of Syrian refugees and and personally welcomed a family of Syrian refugees to New Haven, Ct. after they had been turned away by the state of Indiana. (Photo by Paul Marotta/Getty Images)
Metropolitan Museum of Art Costume Institute Gala - Rei Kawakubo/Comme des Garcons: Art of the In-Between - Arrivals - New York City, U.S. - 01/05/17 - Caroline Kennedy and her son John "Jack" Schlossberg. REUTERS/Lucas Jackson
Rose (L) and Jack Schlossberg (C), grandchildren of former U.S. President John F. Kennedy, pose for a photograph with Lauren Bush Lauren, who accepted the 2014 Profile in Courage Award on behalf of her grandfather, former U.S. President George H. W. Bush, at the John F. Kennedy Library in Boston, Massachusetts May 4, 2014. REUTERS/Brian Snyder (UNITED STATES - Tags: SOCIETY POLITICS)
Rose Schlossberg, Tatiana Schlossberg and John Schlossberg arrive for the Kennedy Center Honors in Washington, U.S. December 4, 2016. REUTERS/Joshua Roberts
Jack Schlossberg presents a John F. Kennedy New Frontier Award to Charles Best, founder of DonorsChoose.org, during a ceremony at the Kennedy School of Government at Harvard University in Cambridge, Massachusetts November 25, 2013. Schlossberg is Caroline Kennedy Schlossberg's son and former President John F. Kennedy's grandson. REUTERS/Brian Snyder (UNITED STATES - Tags: EDUCATION POLITICS)
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