
Chelsea Clinton and husband Marc Mezvinsky embraced their Italian holiday as they snorkeled off the shore of Sardinia on Monday.

The couple joined a few friends, including billionaire Barry Diller and his wife, fashion icon Diane von Furstenberg, for a fun day out on the boat. They jumped into the water in an alcove, surrounded by scenic rocks and cliffs.

They were seen chatting with friends and laying out on the boat before putting on their snorkeling gear and checking out the stunning blue sea.

Chelsea Clinton and husband Marc Mezvinsky relaxed on Monday as they went boating with friends - including billionaire Barry Diller and his wife, fashion icon Diane von Furstenberg - off the shore of Sardinia

The couple, who are vacationing in Italy, went snorkeling in the stunning blue sea off the coast of Sardinia

Clinton and Mezvinsky took a break from snorkeling to chat with friends as they went for a boat ride around the alcove. Fashion icon Diane von Furstenberg is seen sprawled out on the back of the boat, her head tilted towards Clinton

Von Furstenberg is seen toweling on the left, with her iconic red hair, while Mezvinsky and Clinton sit down on the right

Mezvinsky feels out the water while his wife Chelsea hangs back on the boat with von Furstenberg

Barry Diller and his wife Diane von Furstenberg, who appeared to join the Mezvinksys on the outing, are both staunch supporters of the Democratic party

The couple wrapped themselves in towels after swimming and sported sunglasses to block their eyes from the bright sun

Mezvinsky, 37, seemed to enjoy his day out as he smiled and embraced the scene around him while he sat on the boat's ledge

Clinton donned a pair of goggles to go snorkeling off the back of the boat on Monday, covering her bathing suit in a white shirt

Though baby Charlotte was not seen on the outing, the couple were surrounded by friends and security. The couple are expected to bring their daughter with them next week to join Clinton's parents on a vacation in the Hamptons

The couple appeared to have been joined by at least five other passengers on their relaxing day out on the water

Clinton stood near the back of the boat and Mezvinsky sat with a pal while snorkeling gear was sorted out for the group

The couple was no doubt missing their baby girl on their active day out

The nautical stripes of Clinton's mismatched bikini matched the striped upholstery of the glamorous tender

When the boat was parked, one passenger organized where to put the ladder used to get in and out of the water

Clinton, Mezvinsky and other passengers waited in the boat while snorkeling gear was organized and the driver looked into the water

Temperatures topped out at approximately 86 degrees Fahrenheit on Monday while the the couple soaked up the sun.

Clinton, 35, sported a bikini - with a black bandeau top and striped bottoms - and a white top while her 37-year-old husband chose to wear olive green shorts.

Baby Charlotte, who turns one year old next month, was no where to be seen as her parents enjoyed the summer outing.

Clinton may have been fundraising for her mother's campaign over the weekend, as Diller is a outspoken supporter of the Democratic party and contributed $40,000 to President Obama's re-election campaign in 2012.

Diller, who is worth an estimated $2.6billion, is also the chairman of IAC/InterActiveCorp, a media company which counts the young Clinton as a board member.

Diller's wife, von Furstenberg, is New York-based fashion designer who made her breakout in the industry with her iconic wrap dress. Diller is von Furstenberg's second husband, having first married Prince Egon von Furstenberg of Germany in 1969. The couple subsequently divorced in 1972, but von Furstenberg kept her royal last name.

Von Furstenberg is also a staunch supporter of the Democratic party, and once said that she doesn't want any Republicans shopping in her stores.

While attending a Fashion's Night Out event at her store in New York City's Meatpacking District on September 6, 2012, she told a crowd: 'Everyone here better be a Democrat; no Republicans!' That night, President Obama was giving a speech at the Democratic National Convention.

On Monday, the same day von Furstenberg was pictured boating with Clinton and Mezvinsky, she posted a picture on Instagram of the coastline of neighboring Corsica.

Diane von Furstenberg posted this picture of the Corsica coastline to her Instagram account on Monday, the same say that she was pictured boating with Clinton and Mezvinsky off the neighboring island of Sardinia

The pictures taken of the two couples on Monday show them on a smaller jet boat, but it's likely that they were staying somewhere nearby on Diller's yacht, the Eos, which is considered by many to be the largest private sailing yacht in the world.

There are some that say that The Maltese Falcon, a yacht formerly owned by American venture capitalist Tom Perkins, is the bigger of the two since it has a larger deck.

Eos was launched in Germany in 2006 and took three years to build.

While the exterior of the ship has been pictured at various locations around the globe, little is known about the interior which was designed by Francois Catroux. However, it's believed that the interior boats such extravagant details as a glass staircase.

Once the boat was parked, Chelsea Clinton, 35, prepared to go into the water by donning a mask and snorkel

Chelsea Clinton put on a long-sleeved shirt before jumping into the cold water. The white shirt seemed to match her striped bikini bottoms

Chelsea prepared herself for the water by putting on flippers, as her husband enjoyed the sea water as well

Clinton dipped her feet into the water as she put on her flippers. The man next to hear looked ready to jump in before Clinton had her mask and snorkel on

Chelsea Clinton made sure all of her snorkeling gear was in place before she slid into the gorgeous blue water

Donning a green-and-black face mask, flippers and snorkel, Chelsea got into the water and explored the area around her

She went for a nice swim with a friend who was spending the day on the boat with her, Mezvinsky and others

She then appeared to have gone off on her own for some solo exploration time near the water's rocky shore

Clinton smiled as she swam through the water, face mask and snorkel in hand, as another swimmer snorkeled close by

Clinton's face appeared red after swimming - it is unknown as to if it is from wearing the face mask or if she suffered a sun burn

In a week, Clinton, Mezvinsky and their daughter will be joining Chelsea's parents, Democratic presidential candidate Hillary Clinton and former President Bill Clinton, for a vacation in the Hamptons.

Bill and Hillary will head to the Hamptons on August 21, and their daughter and son-in-law with meet them as they spend two weeks in the ritzy seaside town of Amagansett.

In true Hillary fashion though, the vacation won't all be spent cooing over her granddaughter and napping by the pool as she has planned several fundraising events at the summer homes of wealthy Democratic party donors.

The family's vacation comes as the US State Department announced on Monday that it has so far identified 305 emails from Hillary Clinton's private server used while she was secretary of state to be reviewed for potentially classified information.

So far about 60 of Clinton's email messages have been retroactively classified as 'confidential,' 'secret' or 'top secret' since the process began, raising questions about national security risks posed by a cabinet secretary who chooses to use her own home-brew email server instead of a more secure system designed to be hardened against intrusions.

Men on the boat prepared to head into the water, donning masks and snorkels and carrying flippers and Clinton walked around the boat

Temperatures topped out at approximately 86 degrees Fahrenheit on Monday in Sardinia, Italy, where Clinton spent her day

Chelsea took some time to bathe in the sun as she took off her long-sleeved shirt and sported a black bandeau bikini top

She spent time on the back of the boat, absorbing sun rays, but likely had to put on plenty of sunscreen to protect her skin in the bright sun

Chelsea Clinton sported a bikini with a black bandeau top and striped bottoms for the relaxing boat trip

The boat had enough seating area for each passenger to lounge about comfortably in their own area

Mezvinsky chatted with friends and what looked to be a security guard while the boat was parked near an area of rocks

The group was able to enjoy nice scenery while they swam, as they were surrounded by brown rocks and the sparkling sea

Clinton has changed the wording of her explanations in recent months. In March she told reporters that she 'did not email any classified material to anyone on my email; there is no classified material.'

But by late the former secretary of state told Iowa voters during a presidential campaign stop that she was 'confident that I never sent nor received any information that was classified at the time.'

As news broke that at least two of her messages were later classified 'top secret,' Clinton spokesman Nick Merrill shifted to language saying that she didn't send or receive emails 'that were marked classified at the time.'

Last week Clinton herself blended the approaches, telling Iowa Public Radio that she 'never sent nor received any classified email – nothing marked "Classified".'

Clinton and another passenger, who was sporting a walkie talkie, laughed and chatted as they took in the beautiful view

Chelsea Clinton and Marc Mezvinsky dried off with white towels as they chatted with a friend on the boat

Despite the high temperatures, Clinton, Mezvinsky and other passengers wrapped themselves with towels after taking a dip in the water

Mezvinsky wrapped a towel around his shoulders as he bent down to grab something in the boat while he chatted with another passenger

Chelsea enjoyed the water with a hat-wearing Diane while several people, including Mezvinsky, relaxed on the boat

Boat passengers appeared to all enjoy themselves throughout the day - some going snorkeling while others took in the scenery

At a point when several people were lounging on the boat, the group gathered near the back to chat and relax

Chelsea Clinton, Marc Mezvinsky and friends were able to cool off from the heat by jumping into the sea while parked in an alcove