JFK's grandson Jack Schlossberg, 31, shows off his impressive abs in VERY provocative shirtless gym selfie - before heading off for dinner at fast food chain Sonic (less than a year after slamming people for eating out)

John F. Kennedy's grandson Jack Schlossberg has showed off his incredible physique in an extremely revealing shirtless photo while enjoying a late-night workout at the gym.

The Yale and Harvard Law School graduate, 31, offered his 102,000 Instagram followers a close-up look at his incredibly toned abs on Saturday when he snapped a mirror photo during a workout.

In the image, which was shared to his Instagram Stories, Jack - who had at one point been pursuing a career in politics - can be seen posing in only a pair of very-low slung black shorts and a backwards cap, with his washboard abs on full display. 

He used a butterfly emoji to cover the top of his private area, as his bottoms were pulled down slightly.

John F. Kennedy's grandson Jack Schlossberg has showed off his incredible physique in an extremely revealing shirtless photo shared to his Instagram Stories on Saturday

The Yale and Harvard Law School graduate (seen last month), 31, happily flaunted his toned figure with his 102,000 followers on Saturday by sharing a gym thirst trap to his Stories

Afterwards, he uploaded a snap of himself at the drive-through of the fast food chain Sonic, revealing it was his first time at the fast food chain

Last year, Jack went on a bizarre online rant against restaurants on his social media in which he took aim at anyone who enjoys dining out and claimed the act 'ruins your whole life'

It appeared that the photo was taken inside a gym locker room, and Jack was visibly sweaty in the snap.

But the Kennedy heir proved himself to be a great believer in balance, following up the toned gym selfie with an image of himself at the drive-thru of fast food chain Sonic, revealing that it was his first time ever visiting one of the eateries.  

He sat in the drivers seat of his car and posed in front of the menu as he threw up a peace sign.

'First time at Sonic,' he captioned it.

The budding lawyer also shared some clips of himself singing along to some rock songs while driving on Monday.

Jack's trip to Sonic certainly seems to indicate a drastic change in tune for the former politico, who previously made headlines after he went on a bizarre online rant against restaurants on his social media.

He shared a video of himself in July 2023 bashing eateries for serving food 'covered in sugar' and slamming those who enjoy eating out for wasting time 'reading menus' and 'talking' to waiters. 

He even took aim at anyone who enjoys dining out and claimed the act 'ruins your whole life.'

The budding lawyer also shared some clips of himself singing along to some rock songs while driving on Monday

Jack's rant about restaurants was very unusual coming from someone who once said he consumed food from his favorite restaurant almost every day

Jack publicly slammed his cousin Robert F. Kennedy Jr. (seen) last year for spreading 'conspiracy theories' during his presidential campaign

In an Instagram video, Jack called anti-vaxxer RFK Jr.'s candidacy an 'embarrassment,' and publicly endorsed President Joe Biden

'We have to wait there to eat something and we don't get to choose, really, what it is,' he said in the video.

'We only have a couple of choices. And we don't know what any of them will taste like, or what's good. [And the food is] covered in sugar.

'We're gonna sit there for most of the time and wait for some guy to come up and ask us some questions.

'And we're gonna have to f**king talk to some guy about what we want to eat... What we want to put inside of our bodies, which really matter matters a lot, and we are going to let them tell us how to do it.'

Someone from behind the camera then asked Jack why he was so angry about restaurants, to which he responded, 'It ruins your whole life.'

'You spend hours and hours eating at restaurants when you can spend a minute and a half eating something that's good for you,' he added.

It was a very unusual take coming from someone who once said he consumed food from his favorite restaurant almost every day. 

In 2017, while speaking to a local news outlet about his time at Harvard, the then-student couldn't stop gushing about local Cambridge eatery Darwin's, proudly telling the publication: 'That’s the greatest restaurant of all time. I have a turkey sandwich from there at least six days a week.' 

Jack also found himself in the spotlight again later that month, when he publicly slammed his cousin Robert F. Kennedy Jr. for spreading 'conspiracy theories' during his presidential campaign.

In an Instagram video, Jack publicly endorsed President Joe Biden, stating that he was on the way to becoming the country's 'greatest progressive president we've ever had.'

Jack is the son of JFK and his wife, Jackie Kennedy Onassis' only surviving child, Caroline, and her husband, Edwin. JFK and Jackie are seen with Caroline and her brother in 1962

Growing up, Jack (seen with his mom in 2000) lived in New York City and attended the lavish Collegiate School on the Upper West Side - a private all-boys school where tuition is $56,000

He also called anti-vaxxer RFK Jr.'s candidacy an 'embarrassment,' and said that if he cared about his family's legacy he'd support the current occupant of the Oval Office.

'Instead, he's trading in on Camelot, celebrity, conspiracy theories and conflict for personal gain and fame,' added the 31-year-old. 

He's certainly enjoyed the perks of hailing from one of the most well-known families on the globe 

'I've listened to him. I know him. I have no idea why anyone thinks he should be president. What I do know is his candidacy is an embarrassment. Let's not be distracted again, by somebody's vanity project.'

Jack, along with his sisters Rose, 35, and Tatiana Schlossberg, 33 - who are the kids of late former President JFK and former First Lady Jackie Kennedy Onassis' only surviving child, Caroline Kennedy Schlossberg, 66, and her husband, artist Edwin Schlossberg, 78 - grew up in a lavish apartment in New York City. 

He attended an elite, $60,000-a-year private school as a teen, before heading to Yale University for college, followed by Harvard Law School for his masters. 

He's certainly enjoyed the perks of hailing from one of the most well-known families on the globe - attending a slew of VIP events alongside his mother, receiving invites to appear on well-known TV shows, and mingling with some of the top politicians from a young age. 

While Jack has received a slew of opportunities and political leg-ups - he has continuously admitted that he's unsure of what he wants to do and even confessed to struggling to 'make his own way' outside of his 'family's legacy.' 

He has attended a slew of VIP events alongside his mother, receiving invites to appear on well-known TV shows and mingling with some of the top politicians from a young age

While Jack (seen in 2019) has received a slew of opportunities and political leg-ups - he has confessed to struggling to 'make his own way' outside of his 'family's legacy' 

It now appears he has his set his sights on being a lawyer - as he revealed he had passed the bar exam earlier last year. He's seen in 2022

'I’m kind of hedging my bets,' he told Boston.com in 2017. 'I'm not sure what I want to do - business, law, something else.

'I came into law school thinking I really wanted to practice environmental law, and so far my favorite class is in property, which is something I never would have expected. 

'Come three years from now, my interests could be completely different. I’ll always be interested in climate issues, but my idea of what I want to do will probably change.' 

When it comes to his career, he has worked a series of odd jobs over the years. It at first seemed he was going to follow in his grandfather's footsteps - he penned a slew of political pieces for various news outlets and delivered numerous politically-driven speeches - but he then went in a different direction and started to pursue acting. 

He also accompanied his mom, Caroline, on several endeavors when she served as the US Ambassador to Japan from 2013 to 2017. 

During that time, he was able to meet former Secretary of State John Kerry, who couldn't stop gushing about him.

'A sense of humor is not genetic, but apparently in the Kennedy family it can be inherited,' he said.

'In President Kennedy's grandson, Jack Schlossberg, this quality seems to abide.'

It now appears he has his set his sights on being a lawyer - as he revealed he had passed the bar exam earlier last year.