Caroline Kennedy was ‘laughing so hard’ at her portrayal in Love Story: John F. Kennedy Jr. + Carolyn Bessette

Caroline Kennedy was played by Grace Gummer in FX’s Love Story: John F. Kennedy Jr. + Carolyn Bessette.

Caroline Kennedy “laughed so hard” at Grace Gummer’s portrayal of her in Love Story: John F. Kennedy Jr. + Carolyn Bessette.

The FX show retells the tumultuous relationship between the businessman and the publicist – which ended in the pair and her sister, Lauren Bessette, dying after a light aircraft, piloted by JFK. Jr. crashed into the Atlantic Ocean off Martha’s Vineyard, Massachusetts, in July 1999 – and the impact it had on the Kennedy family.

Caroline, 68, and her 33-year-old son, Jack Schlossberg, saw a clip of one scene, which he did not reveal, and they found humour in how she came across as having over-the-top behaviour – insisting that is not how JFK Jr.’s sister acts.

Appearing on the latest episode of Next Question with Katie Couric, the 69-year-old journalist asked Jack if he and Caroline had watched Love Story, to which he initially said: “No.”

But the commentator then remembered: “I showed her a clip of her, and we were laughing so hard.”

Katie asked: “Which clip?”

But referencing Grace’s version of Caroline, Jack admitted: “I don’t even remember. The person is freaking out, and we’re just laughing so hard, as if that’s how my mom acts.”

The writer ultimately branded Love Story: John F. Kennedy Jr. + Carolyn Bessette “stupid”, and reminded viewers to “keep in mind, it might be entertaining, but it’s fiction”.

Jack – who has “no issue” with anyone who watched and liked the show – criticised the way the series’ costume designers dressed Ben Shenkman’s version of his 80-year-old dad, artist Ed Schlossberg.

He told Katie: “Oh, and my Dad! They had my dad dressed up in some plaid outfit. My dad’s the most stylish guy I’ve ever met. So it’s funny. I mean, no issue.”

Katie personally thought Caroline and Ed were not portrayed “in a very positive way”.

Jack chimed in: “Yeah, the two nicest, most dignified, private people in the whole world who do nothing but help others.”

Katie noted that it “must have been frustrating” for the Kennedy family, to which Jack responded: “Whatever. Who cares? Stupid show.”

Grace, 39, said she did a lot of research in preparation to play Caroline.

In March, she told ABC’s On the Red Carpet: “I tried to sort of capture her essence. I’m not interested, as an actor, in imitating people, so I just gathered information all over the place. And through reading and talking to people that she knows, I got an energy sense.”

And during an interview with Town and Country, the star said she has “so much admiration and respect for Caroline”.

Grace added: “And my greatest hope is that I did right by her.”